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See below<BR>
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> Date: Thu, 11 Nov 2010 21:48:19 +0100<BR>> From: lars.ellenberg@linbit.com<BR>> To: drbd-user@lists.linbit.com<BR>> Subject: Re: [DRBD-user] Low performance over NFS after upgrade from 0.7.25 to 8.2.7<BR>> <BR>> On Thu, Nov 04, 2010 at 01:55:56PM +0100, Håkan Engblom wrote:<BR>> > <BR>> > Hi drbd-users,<BR>> > <BR>> > We use DRBD on a system with two fileservers. We have three replicated<BR>> > DRBD-partitions, and on top of that we use ext3 filesystem, and these<BR>> > are exported over NFS,<BR>> > pretty basic setup. NFS-server is in kernel. Linux kernel is<BR>> > 2.6.27.39, running on a x86_64 system. C-protocol for drbd.<BR>> <BR>> > The problem we have is that after the upgrade to 8.2.7,<BR>> <BR>> There is absolutely no reason to upgrade to 8.2, 8.2. is obsolete.<BR>> Upgrade to 8.3.<BR>Technically I agree, but unfortunately there are administrative reasons for taking 8.2.7 and not 8.3<BR>
8.2.7 is included in our linux distro, and the company I work at think it is then supported by our linux<BR>
supplier....<BR>
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> <BR>> > the<BR>> > performance, when creating many small files from an NFS-client, has<BR>> > decreased drastically. <BR>> <BR>> Then read about the disk settings no-disk-barrier, no-disk-flushes,<BR>> no-md-flushes, which did not exist in 0.7, and have performance impact.<BR>
Missed this. Manipulating these settings "solves" the issue.<BR>> <BR>> <BR>> -- <BR>> : Lars Ellenberg<BR>> : LINBIT | Your Way to High Availability<BR>> : DRBD/HA support and consulting http://www.linbit.com<BR>> <BR>> DRBD® and LINBIT® are registered trademarks of LINBIT, Austria.<BR>> __<BR>> please don't Cc me, but send to list -- I'm subscribed<BR>> _______________________________________________<BR>> drbd-user mailing list<BR>> drbd-user@lists.linbit.com<BR>> http://lists.linbit.com/mailman/listinfo/drbd-user<BR><BR> </body>
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