|To:||Mike Snitzer <msnitzer@xxxxxxxxxx>|
|Subject:||Re: Ext4 and xfs problems in dm-thin on allocation and discard|
|Date:||Tue, 19 Jun 2012 15:52:15 +0200|
|Cc:||Lukáš Czerner <lczerner@xxxxxxxxxx>, Dave Chinner <david@xxxxxxxxxxxxx>, Spelic <spelic@xxxxxxxxxxxxx>, device-mapper development <dm-devel@xxxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, xfs@xxxxxxxxxxx|
|References:||<4FDF9EBE.2030809@xxxxxxxxxxxxx> <20120619015745.GJ25389@dastard> <20120619031241.GA3884@xxxxxxxxxx> <alpine.LFD.2.00.1206190816440.2241@xxxxxxxxxxxxxxxxxxxxxxxxx> <20120619131649.GA6811@xxxxxxxxxx> <alpine.LFD.2.00.1206191519320.21961@xxxxxxxxxxxxxxxxxxxxxxxxx> <20120619133041.GB6811@xxxxxxxxxx>|
|User-agent:||Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2|
On 06/19/12 15:30, Mike Snitzer wrote:
I don't recall Spelic saying anything about EOPNOTSUPP. So what has made you zero in on an -EOPNOTSUPP return (which should not be happening)?
Exactly: I do not know if EOPNOTSUPP is being returned or not. If this helps, I have configured dm-thin via lvm2 LVM version: 2.02.95(2) (2012-03-06) Library version: 1.02.74 (2012-03-06) Driver version: 4.22.0from dmsetup table I only see one option : "skip_block_zeroing", if and only if I configure it with -Zn . I do not see anything regarding ignore_discard
vg1-pooltry1-tpool: 0 20971520 thin-pool 252:1 252:2 2048 0 1 skip_block_zeroing
vg1-pooltry1_tdata: 0 20971520 linear 9:20 62922752 vg1-pooltry1_tmeta: 0 8192 linear 9:20 83894272 vg1-thinlv1: 0 31457280 thin 252:3 1 and in dmesg:[ 33.685200] device-mapper: thin: Discard unsupported by data device (dm-2): Disabling discard passdown. [ 33.709586] device-mapper: thin: Discard unsupported by data device (dm-6): Disabling discard passdown.
I do not know what is the mechanism for which xfs cannot unmap blocks from dm-thin, but it really can't. If anyone has dm-thin installed he can try. This is 100% reproducible for me.
|<Prev in Thread]||Current Thread||[Next in Thread>|
|Previous by Date:||Re: Ext4 and xfs problems in dm-thin on allocation and discard, Mike Snitzer|
|Next by Date:||El mensaje enviado a Central espera la aprobacion del moderador, central-bounces|
|Previous by Thread:||Re: Ext4 and xfs problems in dm-thin on allocation and discard, Mike Snitzer|
|Next by Thread:||Re: Ext4 and xfs problems in dm-thin on allocation and discard, Eric Sandeen|
|Indexes:||[Date] [Thread] [Top] [All Lists]|