[Pkg-zfsonlinux-devel] Bug#983086: zfsutils-linux: TRIM crashes SSD drives

[Antonio Russo]

Hello,

On 2/19/21 1:35 AM, Xavier wrote:
> 
> The recently added cron "TRIM the first Sunday of every month" makes some SSD drives crash.
> 
> The problem appears on reasonnably busy and otherwise stable servers:
>    * with about 100 containers,
>    * each on a separate zvol, ext4 mounted with discard option,
>    * on a 6 identical drives raidz2.
> 
> The issue has been observed on these drives:
>    * Micron_5100_MTFDDAK960TCB
>    * Samsung_SSD_850_EVO_1TB
>    * Samsung_SSD_860_EVO_1TB
> 
> When affected (it not always the case), the systems could not complete the cancelling of the trim with:
> # zpool trim -c pool
> Testing trim on one drive only, and reducing the rate to as low as 500000, did not help.

I am trying to understand the symptom---what exactly do you mean the "SSD drives crash"?
Is it just that you cannot cancel the trim? Or is there some other symptom?

> 
> A reset seems the only solution, followed by a zpool trim -c after reboot.
> 
> It would be wise to deactivate that cron by default, or at least to provide some kind of convenient way to do so, like an option in /etc/default/zfs.
> 
> Thank you.
> 
> -- System Information:
> Debian Release: 10.8
>   APT prefers stable
>   APT policy: (900, 'stable'), (500, 'stable-updates'), (400, 'testing')
> Architecture: amd64 (x86_64)
> 
> Kernel: Linux 5.4.19 (SMP w/8 CPU cores)
> Kernel taint flags: TAINT_PROPRIETARY_MODULE, TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
> Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
> Shell: /bin/sh linked to /usr/bin/dash
> Init: systemd (via /run/systemd/system)
> 
> Versions of packages zfsutils-linux depends on:
> ii  libblkid1        2.33.1-0.1
> ii  libc6            2.31-9
> ii  libnvpair1linux  0.8.6-1~bpo10+1
> ii  libudev1         241-7~deb10u6
> ii  libuuid1         2.33.1-0.1
> ii  libuutil1linux   0.8.6-1~bpo10+1
> ii  libzfs2linux     0.8.6-1~bpo10+1
> ii  libzpool2linux   0.8.6-1~bpo10+1
> ii  python3          3.9.1-1
> ii  zlib1g           1:1.2.11.dfsg-1
> 
> Versions of packages zfsutils-linux recommends:
> ii  lsb-base                10.2019051400
> ii  zfs-dkms [zfs-modules]  2.0.2-1
> ii  zfs-zed                 0.8.6-1~bpo10+1
> 
> Versions of packages zfsutils-linux suggests:
> pn  nfs-kernel-server           <none>
> pn  samba-common-bin            <none>
> pn  zfs-initramfs | zfs-dracut  <none>
> 
> -- Configuration Files:
> /etc/default/zfs changed [not included]
> /etc/zfs/zfs-functions changed [not included]
> 
> -- no debconf information

You do not have a consistent set of zfs packages installed---please
fully upgrade to 2.0.3 (or at least 2.0.2).  You have zfs-dkms from
unstable, and the rest of zfs from backports.  I don't know exactly
what you've done to get this setup, but it is not a supported
configuration, and may be dangerous to your data.

Best,
Antonio
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