[zfs-discuss] ZFS and TRIMming procedures

Sam Van den Eynde svde.tech at gmail.com
Tue Apr 12 14:54:37 EDT 2016


Is it possible to query the factory provisioning somehow from within the
system (linux)?


On Tue, Apr 12, 2016 at 6:01 PM, Mihai Vintila via zfs-discuss <
zfs-discuss at list.zfsonlinux.org> wrote:

> There is a simple solution for overcoming trim but you need to know your
> ssd well.
> For example:
> intel s3600 allows up to 95% space utilization before performance drop
> samsung 840/850 up to ~ 70%
> crucial  m5xx  ~ 90%
>
> So to overcome the missing trim simply avoid filling the disc which you
> can best do by creating partitions from beginning or just watch the space
> utilization for individual ssd.
>
> Best regards,
> Vintila Mihai Alexandru
>
> On 4/12/2016 4:17 PM, Kash Pande via zfs-discuss wrote:
>
> This isn't true, not in all cases anyway. For systems with L2ARC, the
> performance can slow to a crawl without occasionally removing the SSD,
> running TRIM, and reinserting it. The performance will remain crap until
> the L2ARC is full, and then eventually it slows again.
>
> The new Nexenta TRIM support will help with this, when the l2arc devices
> use TRIM.
>
> Kash
>
> On 12/04/16 04:29 AM, Gordan Bobic via zfs-discuss wrote:
>
> Why do you think you even need to TRIM your SSDs? SSDs these days are
> adequately over-provisioned and have good enough wear levelling that you
> shouldn't need to do it. I certainly never did it to any of my SSDs (Intel,
> Kingston, Crucial) and they all still run and perform just fine years on.
>
> On Tue, Apr 12, 2016 at 4:28 AM, fddi via zfs-discuss <
> <zfs-discuss at list.zfsonlinux.org>zfs-discuss at list.zfsonlinux.org> wrote:
>
>> Hello,
>> I plan to use ZFS on serveral servers which have a 8 disk raidz2 or
>> eventually 4 disk raidz + ZIL And L2ARC disk.
>> Anway I am concerned about TRIM of SSD disk.
>> What procedure should I use for trimming the SSD disks ?
>> Can I simply take a disk out of the raidz, TRIM it and put it back
>> (Resilvering) ?
>> Smees that  ZFSonLinux lacks of TRIM support for SSD disks ?
>> if so which is the bes proceduret to trim a SSD disk ? unfortunately
>> there is no tune2fs possibility for trimming as  on ext4 or xfs
>> or mount with discard option.
>>
>> thank you
>>
>> Rick
>>
>> _______________________________________________
>> zfs-discuss mailing list
>> zfs-discuss at list.zfsonlinux.org
>> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>>
>
>
>
> _______________________________________________
> zfs-discuss mailing listzfs-discuss at list.zfsonlinux.orghttp://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>
>
>
>
> _______________________________________________
> zfs-discuss mailing listzfs-discuss at list.zfsonlinux.orghttp://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>
>
>
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at list.zfsonlinux.org
> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.zfsonlinux.org/pipermail/zfs-discuss/attachments/20160412/4a0d7cc7/attachment-0001.html>


More information about the zfs-discuss mailing list