[Users] discard support for SSD in OpenVZ kernel

[Kir Kolyshkin]

On 08/27/2013 08:20 AM, spameden wrote:
> ArchLinux wiki says:
> *Warning: *Users need to be certain that kernel version 2.6.33 or 
> above is being used AND that their SSD supports TRIM before attempting 
> to mount a partition with the |discard| flag. Data loss can occur 
> otherwise!
>
> So I guess it's not in the OpenVZ kernel?
>
> I'd like to use TRIM because it increases performance to SSD drastically!

You'd better check it with Red Hat, looking into their RHEL6 documentation.

My quick googling for "rhel6 kernel ssd discard" shows that rhel6 kernel
do support trim, they have backported it (as well as tons of other stuff,
so this is hardly 2.6.32 kernel anymore).


>
>
> 2013/8/27 spameden <spameden at gmail.com <mailto:spameden at gmail.com>>
>
>     is it implemented?
>
>     I've tried on 3.2.0-4 debian wheezy default kernel it's working
>     just fine:
>     # dmsetup table
>     vg0-home: 0 443277312 linear 9:1 25166208
>     home: 0 443273216 crypt aes-cbc-plain
>     0000000000000000000000000000000000000000000000000000000000000000 0
>     253:2 4096 1 allow_discards
>
>     But not on OpenVZ's 2.6.32.xxxx:
>     # dmsetup table
>     vg0-home: 0 443277312 linear 9:1 25166208
>     home: 0 443273216 crypt aes-cbc-plain
>     0000000000000000000000000000000000000000000000000000000000000000 0
>     253:2 4096
>     vg0-swap: 0 4194304 linear 9:1 20971904
>     vg0-root: 0 20971520 linear 9:1 384
>
>
>
>
>
>
> _______________________________________________
> Users mailing list
> Users at openvz.org
> https://lists.openvz.org/mailman/listinfo/users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvz.org/pipermail/users/attachments/20130827/4223569d/attachment-0001.html>