[Users] SSD trim support over a LUKS layer

[Narcis Garcia]

See in the case that /dev/sda1 (Directly mounted as Ext4 on /boot) works
with Trim/Discard.
It's the sda2_crypt (layer over sda2) that is not detected to be
trimmable. Devuan's stock kernel does.

CentOS issue #6548 may not be this same bug; I've tested now with CentOS
6.8 with a similar (but not same) result*:*

$ lsb_release -d
Description:    CentOS release 6.8 (Final)

$ uname -a
Linux localhost.localdomain 2.6.32-642.el6.x86_64 #1 SMP Tue May 10
17:27:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ lsblk --discard /dev/sda
NAME                                                 DISC-ALN DISC-GRAN
DISC-MAX DISC-ZERO
sda                                                         0     
512B       2G         0
├─sda1                                                      0     
512B       2G         0
└─sda2                                                      0     
512B       2G         0
  └─luks-f691f48b-8556-487d-ac64-50daa99ed4c9 (dm-0)        0     
512B       2G         0

$ cat /etc/crypttab
luks-f691f48b-8556-487d-ac64-50daa99ed4c9
UUID=f691f48b-8556-487d-ac64-50daa99ed4c9 none luks,discard

$ mount | grep -e discard
/dev/mapper/luks-f691f48b-8556-487d-ac64-50daa99ed4c9 on / type ext4
(rw,discard)
/dev/sda1 on /boot type ext4 (rw,discard)

$ sudo fstrim /boot
# (same result as Devuan/1 and OpenVZ/6 kernel: success)

$ sudo fstrim /
fstrim: /: FITRIM ioctl failed: Operation not supported


El 26/4/19 a les 21:36, spameden ha escrit:
> Hi.
>
> I've asked this question years ago (in
> 2013): https://lists.openvz.org/pipermail/users/2013-August/005250.html
>
> Let me know if it helps, but this bug should have been fixed in CentOS
> and RHEL at least: https://bugs.centos.org/view.php?id=6548
>
> Maybe OpenVZ maintainers didn't pick up this fix in the openvz6 legacy
> kernel?
>
> Thanks.
>
> ср, 10 апр. 2019 г. в 10:45, Narcis Garcia <informatica at actiu.net
> <mailto:informatica at actiu.net>>:
>
>     Does anybody know how can I solve this?
>
>     $ lsb_release -d
>     Description:    Devuan GNU/Linux 1.0 (jessie)
>
>     $ uname -a
>     Linux bell1 2.6.32-openvz-042stab134.8-amd64 #1 SMP Fri Dec 7 17:18:40
>     MSK 2018 x86_64 GNU/Linux
>
>     $ lsblk --discard /dev/sda
>     NAME           DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO
>     sda                   0      512B       2G         0
>     ├─sda1                0      512B       2G         0
>     └─sda2                0      512B       2G         0
>       └─sda2_crypt        0        0B       0B         0
>
>     $ cat /etc/crypttab
>     sda2_crypt UUID=***** none luks,discard
>
>     $ mount | grep -e discard
>     /dev/mapper/sda2_crypt on / type ext4
>     (rw,noatime,errors=remount-ro,barrier=1,data=ordered,discard)
>     /dev/sda1 on /boot type ext4
>     (rw,relatime,barrier=1,data=ordered,discard)
>
>     $ sudo fstrim /
>     fstrim: /: the discard operation is not supported
>
>     Thank you.
>
>
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