Quoting Tomasz Chmielewski <mangoo@xxxxxxxx>:
On 28.09.2010 10:56, Michael Menge wrote:Cyrus depends on locks and mmap, so your fs must support them. I had written a summery of the diskussions about Cyrus and HA in the old wiki. But the wiki was replaced by the new wiki. I will have a look if I have a copy.I would be grateful.
I didn't find the Wiki Text, but the thread that was the base of this Wiki-Text http://www.irbs.net/internet/info-cyrus/0611/0279.html
If you plan to run in active-passive mode, did you considre Cyrus replication? You will need twice the disk space, but you remove a single point of failure (glustefs)Glusterfs is there to avoid SPOF - as the filesystem sits on two servers. So assuming I won't do rm -rf /gluster-filesystem, it should be quite safe. And it too needs twice the disk space, since it's replicated with glusterfs on both servers.
So there is no differens in diskspace. If glustefs keeps two copies of each file or if you have two Cyrus-Servers. But with Cyrus Replication you don't have the problem with mmap and locking. It may help not to use BDB for the databases. But i don't know how good skiplist is in 2.2.13. Many skiplist bugs have been fixed in 2.3.x
However, I'm of course open to better alternatives. I'm running Debian Lenny, which ships with Cyrus 2.2.13 - not sure if Cyrus replication is possible there? I'd like to stick with distro packages, but if a newer Cyrus version provides features which let you do HA without too much hackarounds, I'll consider upgrading.
Replication was introduced in 2.3.x. There are other features in 2.3.x I don't want to live with out (e.g. delayed expunge). There was a diskussion on the lists about that Debian wants to upgrade cyrus. The main problem is the upgrade path (update of BDB Databases). -------------------------------------------------------------------------------- M.Menge Tel.: (49) 7071/29-70316 UniversitÃt TÃbingen Fax.: (49) 7071/29-5912Zentrum fÃr Datenverarbeitung mail: michael.menge@xxxxxxxxxxxxxxxxxxxx
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