Re: Cyrus and NFS
It might be useful to check the archives, since this comes up alot, and the answers are always the same. For example: http://asg.web.cmu.edu/archive/message.php?mailbox=archive.info-cyrus&msg=11795 http://asg.web.cmu.edu/archive/message.php?mailbox=archive.info-cyrus&msg=11644 and, to a lesser extent: http://asg.web.cmu.edu/archive/message.php?mailbox=archive.info-cyrus&msg=6914 -Rob On Fri, 17 Jan 2003 [EMAIL PROTECTED] wrote: > Hello, > > I've read in the documentation of Cyrus that it was not safe to use NFS. > Now it doesn't tell much more about what really isn't safe with NFS, that's > why I am writting this mail with the following questions: > > - Are ALL usage cases of Cyrus with NFS unsafe ? For example a Cyrus IMAP > server mounting it's partition dir from an NFS server and being the ONLY > one writting to this NFS share, is that also unsafe ? > > - Which cases of usage of Cyrus with NFS are safe, if any ? > > Thanks... > > Regards > > > > > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Rob Siemborski * Andrew Systems Group * Cyert Hall 207 * 412-268-7456 Research Systems Programmer * /usr/contributed Gatekeeper
Cyrus and NFS
Hello, I've read in the documentation of Cyrus that it was not safe to use NFS. Now it doesn't tell much more about what really isn't safe with NFS, that's why I am writting this mail with the following questions: - Are ALL usage cases of Cyrus with NFS unsafe ? For example a Cyrus IMAP server mounting it's partition dir from an NFS server and being the ONLY one writting to this NFS share, is that also unsafe ? - Which cases of usage of Cyrus with NFS are safe, if any ? Thanks... Regards
Cyrus and NFS
Hi, I have been posting questions about using Cyrus IMAP with NFS, using multiple load balanced servers and I am getting a negative response on this approach. We are running Linux on the servers. The advice seems to be to use a single server with the NFS device (Network Appliance). Can anyone out there tell me how many users can a single server support from a single box (a high end Compaq). I know this is depends on email usage but any ideas on how many Netscape Messenger users could be supported. Regards Pat
RE: Cyrus and NFS
I'm curious -- why run Cyrus with the mailstore on NFS?
RE: Cyrus and NFS
Hi, we're using it WITHOUT problems, but on Solaris (and NetApp filers too). One has to use map_nommap, this will slow down everything a little bit, but if you have less then 10.000 mailboxes this is not a problem ! I know, the Cyrus authors tell me "don't use NFS" and ignores all NFS users, therefore I'm thinking about migration to another software. It seems there will be no "real" NFS support in the next time. With "real" NFS support I mean one NFS server with different IMAP servers accessing the same data. Daniel Matuschek Swisscom IP-Plus -Original Message- From: Alex Koshterek [mailto:[EMAIL PROTECTED]] Sent: Donnerstag, 16. November 2000 08:08 To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Subject: Re: Cyrus and NFS ÓÒ , 15 ÎÏÑ 2000, ÷Ù ÎÁÐÉÓÁÌÉ: > Hi, > > Has anybody got Cyrus IMAP working with an NFS mounted Network Appliance Filer successfully. We are using Cyrus under Linux. > The mailboxes file is stored on the NetApp and appears to go offline. The only solution is to remount the NFS device. Is this a Cyrus or an NFS problem. And are there any other known issues using Cyrus with NFS. > Cyrus author don`t recommend use NFS with Cyrus IMAP. Read documentation
Re: Cyrus and NFS
ÓÒ , 15 ÎÏÑ 2000, ÷Ù ÎÁÐÉÓÁÌÉ: > Hi, > > Has anybody got Cyrus IMAP working with an NFS mounted Network Appliance Filer >successfully. We are using Cyrus under Linux. > The mailboxes file is stored on the NetApp and appears to go offline. The only >solution is to remount the NFS device. Is this a Cyrus or an NFS problem. And are >there any other known issues using Cyrus with NFS. > Cyrus author don`t recommend use NFS with Cyrus IMAP. Read documentation
Re: Cyrus and NFS
On Wed, 15 Nov 2000 [EMAIL PROTECTED] wrote: > Hi, > > Has anybody got Cyrus IMAP working with an NFS mounted Network Appliance Filer >successfully. We are using Cyrus under Linux. > The mailboxes file is stored on the NetApp and appears to go offline. The only >solution is to remount the NFS device. Is this a Cyrus or an NFS problem. And are >there any other known issues using Cyrus with NFS. It won't work. First there are locking issues. Given a good client and server implementation of NFS that can likely be overcome. The quality of Linux NFS is determined by which kernel you are using. The locking issue can be avoided by the using only a single Cyrus server to access the message store over NFS. Then there is the use of mmap(), which probably isn't possible to overcome. For instance, Solaris NFS clients refuse to mmap() files on a NFS server. On implementations that allow mmap() over NFS, don't expect it to work in the consistant way that local mmap() with a unified buffer cache should work. > Regards > Pat Fenton Tom
Re: Cyrus and NFS
--On mercredi 15 novembre 2000 19:29 + [EMAIL PROTECTED] wrote: > Hi, > > Has anybody got Cyrus IMAP working with an NFS mounted Network Appliance > Filer successfully. We are using Cyrus under Linux. The mailboxes file > is stored on the NetApp and appears to go offline. The only solution is > to remount the NFS device. Is this a Cyrus or an NFS problem. And are > there any other known issues using Cyrus with NFS. > > Regards > Pat Fenton > Look at the mailing list archives. There has been a lot of discussion about that. The point is : with NFS, you'll certainly experiment intermittent problems (mailbox corruption, ...) because some file operations cannot be made atomic on NFS and because of some locking problems. Michel * * Michel Jouvin Email : [EMAIL PROTECTED] * * LAL / CNRSFax : +33 1 69079404* * B.P. 34 * * 91898 Orsay Cedex * * France* *
Cyrus and NFS
Hi, Has anybody got Cyrus IMAP working with an NFS mounted Network Appliance Filer successfully. We are using Cyrus under Linux. The mailboxes file is stored on the NetApp and appears to go offline. The only solution is to remount the NFS device. Is this a Cyrus or an NFS problem. And are there any other known issues using Cyrus with NFS. Regards Pat Fenton
