2013/8/28 Kir Kolyshkin <[email protected]> > 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). >
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: # hdparm -t /dev/mapper/vg-root /dev/mapper/vg-root: Timing buffered disk reads: 828 MB in 3.00 seconds = 275.56 MB/sec on standard debian-7 kernel (3.2.0-4-amd64): # hdparm -t /dev/mapper/vg-root /dev/mapper/vg-root: Timing buffered disk reads: 1144 MB in 3.00 seconds = 381.15 MB/sec and it's only read speed test. I don't get why it differs so much? > > > > > 2013/8/27 spameden <[email protected]> > >> 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 [email protected] > https://lists.openvz.org/mailman/listinfo/users > > > > _______________________________________________ > Users mailing list > [email protected] > https://lists.openvz.org/mailman/listinfo/users > >
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