The kernel developers introduced a bug into ext4 that has yet to be fixed. If you use xfs you won't have those hangs. On 03/01/2013 01:30 AM, Nikita A Kardashin wrote: > Hello again! > > I am complete rebuild my storage. > As base: ext4 over mdadm-raid1 > Gluster volume in distributed-replicated mode with settings: > > Options Reconfigured: > performance.cache-size: 1024MB > nfs.disable: on > performance.write-behind-window-size: 4MB > performance.io-thread-count: 64 > features.quota: off > features.quota-timeout: 1800 > performance.io-cache: on > performance.write-behind: on > performance.flush-behind: on > performance.read-ahead: on > > As result, I got write performance about 80MB/s on dd if=/dev/zero > of=testfile.bin bs=100M count=10, but I also got some strange things. > If I try to execute above command inside virtual machine (KVM), first > time all going right - about 900MB/s (cache effect, I think), but if I > run this test again on existing file - task (dd) hungs up and can be > stopped only by Ctrl+C. > > Overall virtual system latency is poor too. For example, apt-get > upgrade upgrading system very, very slow, freezing on "Unpacking > replacement" and other io-related steps. > > Does glusterfs have any tuning options, that can help me? > > > 2013/2/27 Brian Candler <B.Candler at pobox.com <mailto:B.Candler at pobox.com>> > > On Wed, Feb 27, 2013 at 02:46:28PM +0000, Robert van Leeuwen wrote: > > You could try to trunk the network on your client but 10Gbit > ethernet ( i suggest to use fiber, because of latency issues with > copper 10Gbit) > > Aside: 10G with SFP+ direct-attach cables also works well, even > though it's > copper. The latency problem is with 10Gbase-T (RJ45 / CAT6(a)) > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org <mailto:Gluster-users at gluster.org> > http://supercolony.gluster.org/mailman/listinfo/gluster-users > > > > > -- > With best regards, > differentlocal (www.differentlocal.ru <http://www.differentlocal.ru> | > differentlocal at gmail.com <mailto:differentlocal at gmail.com>), > System administrator. > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://supercolony.gluster.org/mailman/listinfo/gluster-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20130301/948a9f5a/attachment.html>
