Zfs discard fstrim. Periodic TRIM with cron.

Zfs discard fstrim 3 running a 3 node cluster storing VM's on a 3 disk ZFS pool - all of which is rendered useless if my backups aren't restorable. 3. Repeat (2,3) several times, 5 time will do :) This will confirm that the problem is indeed in 2. Apr 22, 2019 · Hello! We have a couple of servers configured to use local ZFS pools for storage. lsblk -D gives that DISK-GRAN is 4M, DISK-Max is 64M. Apr 23, 2017 · Eg. 8. The drives fully support trim. 而采用 the periodic TRIM method, or apply fstrim manually。 Jan 4, 2024 · After enabling this, trim in the guest OS propagates up to the storage; running fstrim -va in the guest resulted in the ZFS volume in the hypervisor dropping from 167G used to 64G used. However, cards from same company with difference size is ok when formatted as ntfs , and after test, ext4 & btrfs partitions on that card also work well with fstrim. Modern Linux guest systems can use the well known fstrim command to trim a device and free all unused storage on the underlying device: fstrim -av To run TRIM one-shot, you can run fstrim(8) manually. Have not troubleshooted. I opted for fstrim, as it has a systemd timer unit that can be scheduled: sudo systemctl enable fstrim. timer won't TRIM your ZFS pools. ZFS supports either continuous discarding (as a sysctl valuevfs. Guest scsi* disks with the discard option enabled; See Qemu trim/discard and virtio scsi for configuration details. discard fstrim replication zfs Replies: 5; Forum: Proxmox VE: Installation and configuration; TRIM in Windows 7 Gästen. Its is pretty much the same, as it works in VMWARE ESXI, Workstation or the QCOW2 format. Running zfs list again shows that the amount of used space has grown by about 4G as expected. Enable autotrim in the zfs pool, it is off by default. $ sudo systemctl list-timers --all. blkdiscard on the unmounted block device (e. We’ll get to the controller in a second. Next, allocate a 4GB file on the VM. Two of storage servers are empty now, and systemd fstrim by timer takes about 10 hours(!!!). now my pool is almost full with 12 Jan 28, 2021 · I figured out that there is no fstrim script in /etc/cron. 2 and observe if you can import pool normally. This generates a new controller “Controller SCSI 0”. FYI it works fine in Nov 18, 2010 · enable discard on the vm disk, then use "fstrim -a" in your linux vms. ) Apr 10, 2021 · Enable discard and iothread. weekly/fstrim: #!/bin/sh fstrim / Finally, make the script executable: # chmod u+x /etc/cron Jan 26, 2023 · One of the things you can do to keep your SSDs performing well over time is to explicitly discard ('TRIM') disk blocks that are currently unused. Mar 22, 2025 · Trim/Discard If your storage supports thin provisioning (see the storage chapter in the Proxmox VE guide), you can activate the Discard option on a drive. May 27, 2023 · I'm on Proxmox 8. g. zfs. 10上的新ZFS安装选项运行安装在ZFS上的Ubuntu19. zio_trim. fstrim (或者通常是 TRIM/DISCARD) 在 over-provisioned 过度分配的系统上操作和 thin-provisioned 精简分配系统处理方式是不同的。如果系统在每个LUN(不论是不是精简分配)都分配了足够的空间，则不需要TRIM指令。 Aug 25, 2016 · sudo systemctl enable fstrim. For example, on Debian 10: sudo systemctl enable fstrim. timer sudo systemctl start fstrim. The following requirements must be met: The disk format must be VDI. I think zpool trim was a non-upstream ZoL-only feature, so it should be available on FreeBSD 13. . I'm using Ubuntu 20. For NVMe it’s 之前知道 SSD 有 TRIM 的功能，但一直没有深究，直到最近同事问起。目前了解的信息如下，如有错误，欢迎指正。 SSD 在闪存单元中存取数据时有 page 和 block 的概念。SSD 被划分成很多 block, 而 block 被划分成很… The fstrim command was then run on the server and the SAN then showed 159. May 26, 2020 · Hi, This post is only for reclaiming the unused space from VMs, it will not change the designated size of virtual disk. A thick provisioned virtual disk file always has the underlying blocks assigned to it, so I’m pretty sure it’s not going to get to trimmed no matter what you do inside the guest. dd if=/dev/urandom of=bigfile bs=4096 count=1000000 should do the trick. Feb 20, 2023 · linux fstrim命令的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于linux fstrim命令,释放磁盘空间，从根源开始：Linux fstrim命令详解,Ubuntu 16. FreeBSD swap also supports trim at boot. 6MiB consumed. unsupported: 153 kstat. Here's an example using a Red Hat Enterprise Linux (RHEL) system: Here's an example using a Red Hat Enterprise Linux (RHEL) system: 周期性TRIM(Periodic TRIM) util-linux 软件包提供了 fstrim. You have two options. fstrim /backup If that releases the space, its the missing periodic trim that is the culprit Feb 6, 2014 · I have defined a guest, properly set discard=unmap in the domain XML file for it, verified that’s being passed to the guest, but TRIM/DISCARD is just not working. zpool set autotrim=on pool Or run a manual trim. 3 as a desktop and have trim support enabled on the SSD drives I use. This will discard unused blocks once a week, freeing up space on the underlying ZFS filesystem. Online discard Is specified at mount time and triggers in real time without user intervention. Your Linux server should now be configured to periodically TRIM all supported filesystems on a weekly basis. zfs list on the host: fstrim -av The command will trim everything in the pool. 04 LTS and there is no fstrim script in all cron May 16, 2020 · Nimmt die zvol dann auf dem Pool weniger Platz weg, dann hattest du ein Problem mit dem Discard/Trim und du solltest entweder automatisches Discard aktivieren, indem du im Gast unter /etc/fstab zu den Mount-Optionen noch ein ",discard" dranhängst oder du könntest auch täglich/wöchentlich per cron "fstrim -a" laufen lassen. While fstrim is a manual operation, there’s also an automatic option called discard that you can set in your fstab file. Batch discard Is triggered explicitly by the user and discards all unused blocks in the selected file systems. Oct 23, 2018 · systemctl enable --now fstrim. Mar 8, 2024 · Mittels systemctl list-timers fstrim. 2-RELEASE host with NVME disk and: disk0_type="virtio-blk" disk0_name="disk0. 我们将使用 Ubuntu 作为示例，我们使用的示例应该适用于几乎所有版本的操作系统。 Ubuntu 是一个 systemd 发行版，这意味着 fstrim 有一个定期设置为 TRIM SSD 的脚本。 Dec 26, 2010 · This step by step walkthrough will let you take advantage of the TRIM technology for your encrypted SSD partitions for cryptsetup 1. 10。这是在一个Thinkpad X1碳7号，这是在大量的日常使用。没有双启动，所以它一直都是Ubuntu。这台笔记本电脑有一个SSD，据我所知，fstrim不会在ZFS上阅读和工作，所以我要么不得不为我的池运行trim，要么用systemd计时器或cron来调度trim。我过去使用 Aug 19, 2016 · By fstrim, it will de-allocate/discard the 2G so only 3G will be allocated. misc. Why am I not getting credit for that when I move my VM onto my ZFS? Jan 1, 2020 · 我通过19. timer 的 Systemd进程管理器 单元文件。 激活这个 timer 将每周运行服务，这个服务会在所有激活 discard 选项的挂载文件系统上执行 fstrim 。 fstrim命令来自英文词组filesystem trim的缩写，其功能是回收文件系统中未使用的块资源。fstrim命令对固态硬盘和精简配置的存储设备意义较大，有提高驱动器读写效率，延长使用寿命的作用，当然设备一定要支持该命令 Jun 9, 2016 · run "fstrim -v /mnt", there already is an output of 7. The VM is configured for discard=on with virtio-scsi, and I have another ZFS over iscsi disk that shows accurate usage on the guest and the ZFS host (but I have not performed a copy/replace operation on it). It is. 1 or higher. The following line referring to the fstrim. timer. Zpool trim on the host is supposed to clear space from VM disks right? "Discard" is set, It's set as scsi. 1GiB trimmed; run umount and the blkdiscard again and run "hd /dev/mmcblk0" to verify that the eMMC is zeroed out again. Notice that the timer actually activates fstrim. If I issue those commands on the target machine the "REFER" property of the zVol decreases as expected. 簡而言之，fstrim是在核心支援的檔案系統上運行 trim 的命令，例如ext4、等btrfs。f2fs. The ZFS pools do not have reservations set, lz4 compression is on. Jul 29, 2013 · Since ZFS zdev sparse images are truly sparse, the fstrim should release the blocks, so that during backup, empty space on disk is not even scanned as it is sparsely referenced. So if you want to wait for the results that’s what -v flag is for. Significantly more than expected but obviously the discard worked. 1GiB trimmed; run "fstrim -v /mnt" again, output is 0B, so it looks okay; umount and mount "/mnt" again; run "fstrim -v /mnt" a third time and again there's 7. Nov 15, 2022 · Hello, i use a mirrored zfs pool of two hdds. You can compare checking discard to disable disk cache. 这个新的系统服务可以使你的生活更轻松。 -- Alan Formy-duval（作者） 在过去的十年中，固态驱动器（SSD）带来了一种管理存储的新方法。与上一代的转盘产品相比，SSD 具有无声、更冷却的操作和更快的接口规格等优… Aug 25, 2020 · 您要求的是高度特定于iscsi目标实现的内容。它们中的大多数不执行1:1的scsi命令映射，因此如果iscsi目标模拟硬盘-它不会绕过未识别的命令(包括。 Apr 10, 2021 · Enable discard and iothread. So your 1. My current setup hast two internal zfs pools. Each write operation performed on a NAND flash cell causes its wear. May 5, 2014 · Perfect, in that case, if you enable discard and run `fstrim -av` on the guest. service. So, how do I ensure that LVM trims SSD backed storage that is not on ZFS? EDIT: I guess this needs to be a PV level operation Apr 28, 2021 · zfs list indicating the storage utilization for a zfs subvolume associated with our VM disk. This specifies that a VDI image will be shrunk in response to the trim command from the guest OS. To test generate a file with random bytes of size 1-2gb, or download a linux iso of your favorite distro. EXT4 on Linux supports trim. Not all filesystems support both methods. 04 Ubuntu after which that one stopped working. 要禁用连续 TRIM，请从所有行中删除单词 discard。保存文件，然后退出。 在 Linux 中使用定期 TRIM. So far my tests have not shown this to be happening. This fact limits the SSD lifespan. This time test1 reported a size of 179. Slowing wear out. timer Done! Or am I… Now, there are additional considerations to be made during backup. I'm using Proxmox 6. Compacting the Ubuntu VM’s Virtual Hard Disk (VHDX) To actually free the space you got back from the trim command above you need to shut down the Ubuntu VM. I can fstrim on the VM, and the space gets freed just fine on the zfs pool on the host. If you see it's inactive and/or disabled, you can enable and start it with:- sudo systemctl enable fstrim. 3 ZFS version. Third storage server is filled up with 20TB of data and fstrim takes about 30-40 minutes (there i can not understand the magic of such small fstrim time on this server). If it works you really should enable discard for all your VMs and create a cronjob to run fstrim -a once a day. enabled=1), or occasional trimming via zpool-trim(8), thus factually providing a true BSD alternative for fstrim. Thanks in advance. 3. On a HDD ZFS pool a VM with discard-option AND ssd-emulate works: fstrim -va reports things done. Wait like 10 minutes to see if it just being slow. Like aaron already said, if you use ZFS/CEPH or LVMthin you need to manually setup discard everywhere. Only ntfs partition on that card shows that fstrim: /: the discard operation is not supported. FS on all servers Mar 23, 2025 · There are two basic approaches to issue the discard command — using mount discard option (-o discard) for continuous discard or periodic calls of fstrim utility. Apr 20, 2020 · I'm looking to periodically trim all drives via a script, My servers have a mix of ext4 and zfs. You have to set up discard/fstrim in every VMs guestOS to actively report deleted blocks down the storage chain so ZFS knows what blocks got deleted to free up that space. May 20, 2013 · Hello, I have problems with various VMS that seems do not release unused space. Aug 16, 2021 · Hi all, I have a zfs pool with 6 1TB SSD drives. I have more than 5TB of free space on the VM but Ceph does not. Jul 10, 2024 · Hello I want to open this thread because all other threads, that I found, did not mention my use-case. In particular, ZFS on Linux doesn't support them, and so the regular fstrim. May 5, 2019 · Hi again I've been trying all day to get fstrim working inside unprivileged LXC containers with no luck. bytes: 0. When I ran fstrim verbosely in the guest Debian OS after adding discard to fstab it said that it trimmed 51GB. 固态硬盘. Using FreeBSD 10. Nov 10, 2016 · Trimming from Inside the Ubuntu VM with Fstrim. A bit less in this case since I’m utilizing Mar 25, 2017 · I do understand how ZFS thin-provisioning works. The weekly fstrim will then trim all of the free space again because of reboots since last week. Word has it that Linux XFS fstrim is slow. 2. Do I need to periodically run something like fstrim -v / as I would have on Linux? I ran this command on my Linux box roughly weekly. This might be a ZFS-side thing though as there is NO way to trigger a TRIM. Again, it is about the discard and ssd-emulation option because I don't get it. 04 下ZFS文件系统怎么启用 TRIM-CSDN论坛的信息别忘了在本站进行查找喔。 fstrim (或者通常是 TRIM/DISCARD) 在 over-provisioned 过度分配的系统上操作和 thin-provisioned 精简分配系统处理方式是不同的。如果系统在每个LUN(不论是不是精简分配)都分配了足够的空间，则不需要TRIM指令。 Mar 5, 2025 · This is a tutorial on how to make fstrim run more often or on days that you wish. 4 or higher and kernel 3. Host 'fstrim' can only run against mounted filesystems and the LVs used for guest storage do not get mounted on the host. failed: 0 kstat. For example, if your / directory is on an SSD: # fstrim / To automate running TRIM, use cron or add the discard option to /etc/fstab. img" VM has its own ZFS subvolume. These pools have Thin Provisioning enabled. Jun 27, 2021 · 实际上做不做 Trim/Discard 操作对于 HDD 类型的文件系统来说没什么影响， HDD 可以 覆盖使用，但是 SSD 不允许覆盖，只能在系统要求在相同的地方写入数据时先擦除再写入，这会影响 SSD 的性能，因此建议 SSD 做 Trim/Discard 操作。 May 22, 2020 · the vms already have the VirtIO SCSI driver and also fstrim was executed, but as in this article below, ceph's RBD does not see these deleted data, unless fstrim is executed on the RBD itself and on Proxmox I can't see where the RDB is mounted. I'm fairly new to proxmox and i would like to know if i can use the discard option on my VM. fstrim (on the mounted file system) if you want to keep the data but discard the blocks that are unused. Inside your guest OS, enable trim. 4. trim. Before that, open up “Performance options” and select unmap for both “Discard mode” and “Detect zeroes” (for details, check the QEMU documentation) Jan 19, 2024 · UFS and ZFS support trim. The flag -a means all cache pool fstrim -v {mount point} This command will trim a specific mount point and with the -v flag it will show you the results when it’s done. I the example above, the filesystem (ext4) is stored directly on the lv, without another partition table as it happens if the lv is used as virtual disk for qemu/proxmox. I've been doing a bit of testing with trim, and I don't really understand what Im seeing. the two options can substitute each other. 1MiB. As a result, I became distrustful of EXT4's trim feature and started using fstrim periodically to keep the SSD maintained properly. " Mar 6, 2014 · I then reacted to this anomaly by periodically issuing a fstrim -v /. 确定转接卡和lsblk查看trim开启正常后,就可以使用fstrim来做trim啦 fstrim /挂载目录 8. However, with the latter, there is also a command to free the unused space occupied by zeros to free space after you delete lots of files in the VM and zeroed the free space. Edit: Looks like a fstrim -a is working on another unprivileged LXC Feb 8, 2024 · LXC LVM-thin discard fstrim Hi, We are running a server with several LXC containers. zpool trim pool Jul 16, 2016 · Not sure if this is the right area but seems appropriate. I get: # fstrim / fstrim: /: the discard operation is not supported /etc/fstab has: UUID=string / ext4 rw,relatime,nobarrier,data=ordered,errors=remount-ro 0 1 kvm config: virtio0 Jan 2, 2020 · The laptop has a SSD, and as I understand it fstrim doesn't read and work on ZFS so I either have to run on trim for my pools or schedule trim with systemd timers or cron. YMMV. e. Both tests on Ubuntu Server 14 Backup Test 1 Filesystem Zeroed, no fstrim ran Feb 12, 2020 · $ sudo systemctl enable fstrim. Enables the auto-discard feature for a virtual hard disks. timer Verify. success: 0 kstat. Not all filesystems support the block discarding related features that fstrim needs, although ext4 and btrfs both do (for btrfs, see their Trim/discard page). After deleting a large amount of data in the VM (from approximately 1 TB down to ~300 GB), I expected the free space to be released on the ZFS level. Apr 26, 2018 · It also differs depending on the used file system in linux, for zfs u have to enable autotrim, for others add "discard" to /etc/fstab options. This works with VirtIO block devices although next time I set up a VM I’ll still prefer using VirtIO SCSI. The kernel loses that info after a reboot. The timer is typically set to run once a week, which should be fine for most Guest 'fstrim' thins the sparse filesystem with no knowledge of the underlying physical storage. Here is the VM Config: Here is the fstab: Here is the LVM config: Here is the Filesystem free disk space: I've also issued fstrim manually after poweroff/poweron the VM: But when I investigate du on Oct 6, 2019 · Thank you so much! Is pct fstrim the only way to trim the container? I tried running fstrim from inside the debian 10 lxc and it doesnt seem to do anything Apr 10, 2024 · The ZFS Pool on the Host System is also sitting on top of a LUKS / Cryptsetup Full-Disk-Encryption, although I do NOT think this is relevant for the issue described here (since the Host ZFS Pool is sitting on top of the DMCrypt / LUKS Device). Eigentlich müsst ihr nur die Discard Option auf dem Disk setzten und der Rest sollte schon gegeben sein. About running fstrim twice: the history about what was discarded is only kept in RAM. Jun 6, 2023 · 2. Mounting the ext4 filesystem with discard has no effect, and fstrim / always reports: fstrim: /: FITRIM ioctl failed: Operation not supported. Initially I thought it was just a Debian/Ubuntu issue, but I've tried multiple OS templates and it always results in: FITRIM ioctl failed: Operation not permitted. Initiates an immediate on-demand TRIM operation for all of the free space in a pool. The size of the cleared area must be at Feb 3, 2018 · The fstrim command will be issued by a weekly cron job on /, which will be the mount point of /dev/md0, which will be the RAID1. This server data pool is under LVM-thin and as time goes by, disk space keeps on increasing. Linux Guest Configuration. My pool is ZFS and the disk is RAW format. If you need to reclaim more space, you will need to fill the unused space on the guest with 0's and then run fstrim. 7. Periodic discard Oct 16, 2018 · 首先建立ZFS pool 後，在GUI上新增pool 時，勾選 thin provisioning。 nano /etc/fstab ext4 後面新增 discard fstrim -v / nano /etc/cron. 安装后，您需要为固态驱动器启用 TRIM。 你可以通过运行检查哪些设备允许 TRIM： $ lsblk --discard 如果 DISC-GRAN（丢弃颗粒度）和 DISC-MAX（丢弃最大字节数）列非零，这意味着该块设备有 TRIM 支持。 NVMe devices should not be issued discards 其实是NVME设备不要通过文件系统主动调用discard，即下面的 continuous TRIM方式： Using the discard option for a mount in /etc/fstab enables continuous TRIM in device operations: /dev/sda1 / ext4 defaults,discard 0 1. thin provisioned. XFS on linux may require you to run fstrim occasionally. timer will appear. Aug 23, 2023 · Hello, I’m facing a similar issue as described in this thread. When I create a virtual disk on this zfs pool for a VM using VirtIO (leaving discard box unchecked), the guest OS identifies the device as trimmable (confirmed using lsblk --discard inside the VM). Should I be able to shrink the disk file within the pool, or will it always stay at that size, just with free space within it? DESCRIPTION. This operation informs the underlying storage devices of all blocks in the pool which are no longer allocated and allows thinly provisioned devices to reclaim the space. Until it's finished, storage is almost non-responsive to any IO. 由於 ZFS 不僅僅是一個檔案系統（它也是一個磁碟區管理器），因此它有自己的修剪實用程式來修剪 Zpool（ZFS 儲存系統的頂級元件），該實用程式由命令運行zpool trim。 Jan 26, 2020 · Goto “Advanced options”, change the bus to “SCSI”, apply. (e. above are effectively "read only" with normal daily use, and the slow down on writes is when you update the boot. I have used btrfs in the past and there I ran trim on a schedule since it slowed me down a little to enable discard (trim). 22 votes, 13 comments. The only requirement is that the guest is not encrypted with something like LUKS. Periodic TRIM with cron. Jan 16, 2024 · Like already said, checking "discard" isn't enough. Examine dmesg for errors. Then run the Mar 6, 2024 · Hello, I have problems with various VMS that seems do not release unused space. (for windows they are a schedule task in "optimize disk" tool) (before the migration, it was possible to enable agent option: "fstrim", to do it for you after disk migration) Oct 17, 2015 · sudo fstrim -a Going forward, you can either add ‘discard’ to the mount options in fstab, or use fstrim periodically. Since ZFS is more than just a filesystem (it's also a disk volume manager), it has it's own trim utility to trim a Zpool (the top component of a ZFS storage system), which is run by the zpool trim command. 1. I used to think that Thin Provisioning + ZFS was enough to have the VMs use on physical storage the same space that they are using into themselves, but it seems I was Feb 22, 2020 · Try to run a fstrim -a on your host to do a manual discard of all mounted filesystems and look if it frees up stuff. ZFS can have auto trim enabled on the pool, and for other file systems definitely just enable the systemd fstrim timer. Created with Disks -> ZFS -> create: ZFS One is SSD and the The proxmox host and zfs pool correctly identify these drives as non-trimmable. Every single time. Note: don't run the FreeBSD trim command on a partition or disk. You should reclaim the space. 6 The reason for asking is because the backup of this specific VM keeps increasing without me putting data on that vm Aug 1, 2014 · I can't tell you whether the SAS2008 with IT firmware supports TRIM or not (but I suspect it does). Hello everybody. I checked using both lsblk --discard and zpool status. edit: Under storage: Thin Provision checked. I currently use fstrim -av for the mounted etx4 volumes but what's the equivalent command for ZoL? fstrim (或者通常是 TRIM/DISCARD) 在 over-provisioned 过度分配的系统上操作和 thin-provisioned 精简分配系统处理方式是不同的。如果系统在每个LUN(不论是不是精简分配)都分配了足够的空间，则不需要TRIM指令。 Jun 30, 2020 · So do I need to setup discard/fstrim at all inside my LXC guestx or will PVE do a fstrim for all LXCs datasets on host level? All my LXCs are ZFS datasets on a thin-provisioned ZFS SSD pool or LVs on a thin-provisioned LVM-thin so some kind of TRIM/discard should be required. sudo systemctl start fstrim. Then you can verify that the timer is enabled by listing all of the timers. If you have created thin provisioning and given the virtual disk 10GB, download a 5G file in VM then deleted it, running fstrim -av can give you 5G space back, but your virtual disk’s designated size is not changed, it can still use 10G at maximum) Feb 17, 2023 · fstrim is enabled, and in my VM settings I have Discard checked. With Discard set and a TRIM-enabled guest OS [29], when the VM’s filesystem marks blocks as unused after deleting files, the controller will relay this information to the storage, which Oct 12, 2018 · Here fstrim is effective issuing trim commands for all the not-currently-used space on the disk. Boot with ZFS 2. It tells the system to clear unused blocks immediately after a file is deleted. You didn't provide information on the host system but as an example if you are using zfs to back your host storage, discard will not automatically trim your physical ssd. This could be handy if you have stuff continuously writing to the drives which then later gets deleted, which would cause it to create a large amount of unused data. I've read that TRIM is automatically enabled for SAMSUNG SSD. To tell the hypervisor which blocks can be reused issue the following command: sudo fstrim -v / This should not take too long. Here is the VM Config: Here is the fstab: Here is the LVM config: Here is the Filesystem free disk space: I've also issued fstrim manually after poweroff/poweron the VM: But when I investigate du on Jan 19, 2019 · On the ZFS host, I see that the zfs dataset shows 74T used. and 2. Guten Tag Zusammen, ich habe vor kurzem die Dec 22, 2019 · To put it short, fstrim is a command to run trim on filesystems that support this by the kernel, such as ext4, btrfs, f2fs etc. May 1, 2024 · Not a proper answer, but you might also try mounting the filesystem with the discard option instead of using fstrim. Nov 20, 2024 · On a SSD ZFS pool a VM with discard-option enabled works: fstrim -va reports things being done. daily/fstrim Apr 24, 2023 · Hi, Have created a Ubuntu VM on a FreeBSD 13. (You can also set the discard option on the mountpoint, as I recall, or periodically use fstrim to do either as-needed (zfs style) or bulk trims, respectively. Upgraded some machine from 20. A lot of people recommend against this, but that’s mostly because it has nasty performance implications with SATA drives because of interactions between the TRIM command and command queueing for those drives. However, I do have some other suggestions, but first of all, since you haven't given much information about OS and filesystems in use, I will assume you are using Linux and some filesystem other than ZFS (apparently TRIM on ZFS is rather new) given you mention fstrim and cron. You can try to run a simple trim directly, i. 0. timer ; Your server should now TRIM all mounted filesystems that support the operation, once weekly. Conclusion. It simply erases Apr 24, 2017 · kstat. To streamline the experiment the lun on test1 was remounted with the discard option, which requests TRIMs as necessary, and the last step repeated. weekly. 0+ only, following the OpenZFS rebasing. systemctl status fstrim. Recent versions of mdadm will pass through the trim to the individual hard disks themselves. true. For the vms I have discard enabled and ssd emulation. How that is done depends on the OS your VM is running. May 24, 2012 · hello using ceph and local zfs , with kvm's with discard set in pve, fstrim does not work. I have a VM with Ubuntu Server 24. /dev/mmcblk0) to discard all blocks (renders data inaccessible through normal means, but does not promise to securely erase them). And check when the timer last ran and will run next, using: systemctl list-timers --all. Feb 5, 2018 · Problem war und ist, dass sich in der VM fstrim nicht aufrufen lässt, um frei gewordenen Speicher freizugeben, obwohl die Discard-option für die betroffene Partition gesetzt wurde und "zfs get reservation" bestätigt, dass es möglich sein müsste ("reservation none"). "Freed blocks are not TRIMed immediately, there is a low priority thread that TRIMs ranges when the time comes. service 和 fstrim. ZFS on Linux has support for TRIM commands for some time; the development version got it in 2019, and it first appeared in ZoL 0. 3 and observe if you can no longer import the pool. 如果fstrim提示设备不支持的话，要确定分区的格式，要是ext4、xfs等支持trim的格式才行. trimming tends to be for performance reasons on blocks recently made free. Sometimes there would be nothing to trim, other times, there would be ~ 500mb that fstrim took care of that the file system didn't do on it's own. You'll need to use the --nonrotational on and --discard on options:--discard. Add the following lines to /etc/cron. Aug 26, 2020 · sudo mount /dev/sdb1 /iscsi-share sudo dd if=/dev/zero of=/iscsi-share/zero bs=1M count=512 sudo rm /iscsi-share/zero sudo fstrim /iscsi-share but the shell responds with "fstrim: /iscsi-share: the discard option is not supported". discard mount option. Unfortunately, it seems that the guest can't run fstrim, it says: fstrim: /: the discard operation is not supported I have two Oct 9, 2023 · The debate: fstrim vs. This is from where the actual fstrim is called. Mehr ist es auch nicht. timer, könnt ihr euch diesen Timer ansehen und wann er wieder einen Trim ausführt. Note that this requires that the 'discard=1' option is set on the disk per step 8 above. The trim command has no knowledge of the underlying filesystem. 04 on Proxmox 8. The general consensus on modern SSDs is that doing in-line TRIM actually hurts performance, as opposed to doing a scheduled fstrim all at once during non-peak hours, kind of like a backup or scheduled maintenance. timer If discard is not enabled, and the system does not trim from time to time - there are no way space can be relaimed. Now, some say “Why bother with fstrim when you have the discard option?” I understand the Oct 28, 2020 · On most systems, getting the performance back is usually a simple matter of issuing a filesystem trim (fstrim) command. Online discard operations discard only blocks that are transitioning from the used to the free state. Performance wise it is a bad thing to run discard/fstrim every time you free a block of data so it is advisable to have discard unchecked and then run fstrim on a regular basis. wdribhbi nms khga qoh shpma lfltd lxvfgw wvyb duit rlnag matol qll aew vqjd shwf