<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">2013/8/28 Kir Kolyshkin <span dir="ltr"><<a href="mailto:kir@openvz.org" target="_blank">kir@openvz.org</a>></span><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div>On 08/27/2013 08:20 AM, spameden wrote:<br>
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<div>ArchLinux wiki says:<br>
<b>Warning: </b>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 <code style="display:inline-block;padding:0.1em 0.3em">discard</code>
flag. Data loss can occur otherwise!<br>
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So I guess it's not in the OpenVZ kernel?<br>
<br>
I'd like to use TRIM because it increases performance to SSD
drastically!<br>
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You'd better check it with Red Hat, looking into their RHEL6
documentation.<br>
<br>
My quick googling for "rhel6 kernel ssd discard" shows that rhel6
kernel<br>
do support trim, they have backported it (as well as tons of other
stuff,<br>
so this is hardly 2.6.32 kernel anymore).<br></div></blockquote><div><br></div><div>I've just tested via hdparm (ofc it's not a perfect tool to test out disk performance but still), here is what I get on the latest 2.6.32-042stab079.5:<br>
<br># hdparm -t /dev/mapper/vg-root<br>/dev/mapper/vg-root:<br> Timing buffered disk reads: 828 MB in 3.00 seconds = 275.56 MB/sec<br><br></div><div>on standard debian-7 kernel (3.2.0-4-amd64):<br># hdparm -t /dev/mapper/vg-root<br>
/dev/mapper/vg-root:<br> Timing buffered disk reads: 1144 MB in 3.00 seconds = 381.15 MB/sec<br><br></div><div>and it's only read speed test.<br><br></div><div>I don't get why it differs so much?<br></div><div><br>
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<div class="gmail_quote">2013/8/27 spameden <span dir="ltr"><<a href="mailto:spameden@gmail.com" target="_blank">spameden@gmail.com</a>></span><br>
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<div>is it implemented?<br>
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I've tried on 3.2.0-4 debian wheezy default kernel it's
working just fine:<br>
# dmsetup table<br>
vg0-home: 0 443277312 linear 9:1 25166208<br>
home: 0 443273216 crypt aes-cbc-plain
0000000000000000000000000000000000000000000000000000000000000000
0 253:2 4096 1 allow_discards<br>
<br>
But not on OpenVZ's 2.6.32.xxxx:<br>
# dmsetup table<br>
vg0-home: 0 443277312 linear 9:1 25166208<br>
home: 0 443273216 crypt aes-cbc-plain
0000000000000000000000000000000000000000000000000000000000000000
0 253:2 4096<br>
vg0-swap: 0 4194304 linear 9:1 20971904<br>
vg0-root: 0 20971520 linear 9:1 384<br>
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