[PVE-User] Trim and ZFS pools on SSD...

[PVE-User] Trim and ZFS pools on SSD...

[Marco Gaiarin]

I've asked this some month ago, eg i've asked if there's in PVE some
'framework' to enable trim for SSD ZFS pools. At that time the reply was no.


Now seems arrived, seems a standard debian feature for 'zfsutils-linux': at
the crontab /etc/cron.d/zfsutils-linux :

 # TRIM the first Sunday of every month.
 24 0 1-7 * * root if [ $(date +\%w) -eq 0 ] && [ -x /usr/lib/zfs-linux/trim ]; then /usr/lib/zfs-linux/trim; fi

and /usr/lib/zfs-linux/trim script seems to automatically trim every pool
that have not 'autotrim' enabled and have defined the custom property:

	org.debian:periodic-trim

but i've not found info on debian and PVE documentation.


Someone can confirm that? I've simply to do something like:

	zpool set org.debian:periodic-trim=yes rpool


Thanks.

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Re: [PVE-User] Trim and ZFS pools on SSD...

[Ralf Storm]

Hi,

make sure your Vdisks are connected via scsi and the scsi controller is 
virtioscsi, the discs need to have the checkmark "discard".

You can check if it works under ubuntu and debian wit hte command 
"fstrim -av" - if there is no output it doesn`t work, otherwise, after a 
while you will get the trim results displayed.


hope that helps....


Am 20/01/2022 um 11:55 schrieb Marco Gaiarin:
> I've asked this some month ago, eg i've asked if there's in PVE some
> 'framework' to enable trim for SSD ZFS pools. At that time the reply was no.
>
>
> Now seems arrived, seems a standard debian feature for 'zfsutils-linux': at
> the crontab /etc/cron.d/zfsutils-linux :
>
>   # TRIM the first Sunday of every month.
>   24 0 1-7 * * root if [ $(date +\%w) -eq 0 ] && [ -x /usr/lib/zfs-linux/trim ]; then /usr/lib/zfs-linux/trim; fi
>
> and /usr/lib/zfs-linux/trim script seems to automatically trim every pool
> that have not 'autotrim' enabled and have defined the custom property:
>
> 	org.debian:periodic-trim
>
> but i've not found info on debian and PVE documentation.
>
>
> Someone can confirm that? I've simply to do something like:
>
> 	zpool set org.debian:periodic-trim=yes rpool
>
>
> Thanks.
>
-- 
Ralf Storm

Systemadministrator


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Re: [PVE-User] Trim and ZFS pools on SSD...

[Marco Gaiarin]

Mandi! Ralf Storm
  In chel di` si favelave...

> make sure your Vdisks are connected via scsi and the scsi controller is 
> virtioscsi, the discs need to have the checkmark "discard".
> You can check if it works under ubuntu and debian wit hte command 
> "fstrim -av" - if there is no output it doesn`t work, otherwise, after a 
> while you will get the trim results displayed.

No, sorry, i've posted two 'trim/discard' topic that (apart this) are
totally unrelated.


I'm speaking now of host OS, eg PVE: if i have an SSD-based ZFS pool, how
can i trim it?

Seems that recent 'zfsutils-linux' package add some 'framework' to do trim,
but seems (totally) undocumented. So i'm seeking feedback.


I hope i was clear now...

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Re: [PVE-User] Trim and ZFS pools on SSD...

[Marco Gaiarin]

> Someone can confirm that? I've simply to do something like:
>         zpool set org.debian:periodic-trim=yes rpool

Seems sufficient to do:

	zfs set org.debian:periodic-trim=enable rpool

to have the pool get trimmed.


I hope will be documented, sooner or later.

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Re: [PVE-User] Trim and ZFS pools on SSD...

[Marco Gaiarin]

Mandi! Arjen via pve-user
  In chel di` si favelave...

> You can enabled the autotrim feature of the ZFS pool or run zpool trim <your-pool>.
> To get more information use this command on PVE: man zpool trim
> Is that what you were asking for?

No, 'autotrim' is a potentially dangerous option, because 'trim' can happen
on a inpredictable way, leading to server load, ...


It is better to schedue trim in non-working hour, so the script.

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