[Users] discard support for SSD in OpenVZ kernel

LightDot lightdot at gmail.com
Tue Aug 27 12:42:43 EDT 2013


What's Arch got to do with OpenVZ RHEL based kernel?

Red Hat backports different functionality into RHEL kernel and the thing
you're using is far far from plain vanilla 2.6.32 or any other distro's
2.6.32.

Anyway, RHEL 6 does have trim support, simply refer to the relevant docs:
https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/newmds-ssdtuning.html

There's also a myriad of how-to's on the net about RHEL and SSDs... There
are also Proxmox threads about SSDs and Debian converted OpenVZ RHEL
kernels, if that's what you're using.

Regards




On Tue, Aug 27, 2013 at 5:20 PM, spameden <spameden at gmail.com> 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!
>
>
> 2013/8/27 spameden <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
>>
>>
>>
>>
>
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