On Wed, 31 Dec 2008, Adam Tauno Williams wrote: > On Wed, 2008-12-31 at 11:47 +0100, LALOT Dominique wrote: >> Thanks for everybody. That was an interesting thread. Nobody seems to >> use a NetApp appliance, may be due to NFS architecture problems. > > Personally, I'd never use NFS for anything. Over the years I've had way > to many NFS related problems on other things to ever want to try it > again. NFS has some very interesting capabilities and limitations. it's really bad for multiple processes writing to the same file (the cyrus* files for example) and for atomic actions (writing the message files for example) there are ways that you can configure it that will work, but unless you already have a big NFS server you are probably much better off using a mechanism that makes the drives look more like local drives (SAN, iSCSI, etc) or try one of the cluster filesystems that has different tradeoffs than NFS does >> I believe I'll look to ext4 that seemed to be available in last >> kernel, and also to Solaris, but we are not enough to support another >> OS. > > We've used Cyrus on XFS for almost a years, no problems. > > In regards to ext3 I'd pay attention to the vintage of problem reports > and performance issues; ext3 of several years ago is not the ext3 of > today, many improvements have been made. "data=writeback" mode can help > performance quite a bit, as well as enabling "dir_index" if it isn't > already (did it ever become the default?). The periodic fsck can also > be disabled via tune2fs. I only point this out since, if you already > have any ext3 setup, trying the above are all painless and might buy > you something. it's definantly worth testing different filesystems. I last did a test about two years ago and confirmed XFS as my choice. I have one instance of cyrus still running on ext3 and I definantly see it as a user in the performance. David Lang ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
