Le jeudi 17 juillet 2008 à 09:38 -0400, Tres Seaver a écrit : > >> I have one client whose setup is similar (Linux, but using a "big iron" > >> SAN), where the first phase of incremental repozo backup (the part > >> checking whether incremental is possible) takes longer by a factor of > >> two than just doing a full backup. Putting it on local disk both makes > >> writes go faster and makes incremental backup feasible. > > > > Actually, I've already seen that "big reads/writes" are efficient on the > > SAN (more than 40 MB/s) but small ones (many 'seek' and 'read' of 8 Ko > > as made by ZEO) are not efficient at all ; I'll try to see if putting > > ZEO databases as well as Zope clients caches on local disks (which are > > also mirrored) can be more efficient (a hourly cron job can then copy > > ZEO databases on the SAN for data security, I think...). > > Rather than copying the open file, which can potentially lose a > transaction which occurs during the copy, I would use the 'repozo' > script to create backup sets onto the remote drive.
Hi, Just to end up this discussion, I think I finally managed to solve all my problems... So in fact : - I moved all ZEO databases and ZEO clients caches on the local file system ; even mirrored, read/write performances for ZEO/Zope processes are far better than what they were on the SAN - as this site is an internal site, nightly transactions are unlikely to occur ; so I can use repozo but a simple file copy may often be sufficient to save data on the SAN - adding a QueueCatalog makes full-text indexing defferable, and modified objects stores quick - system hangs seems to be caused by swapping : as soon as the Zope process starts to swap on this Solaris box, all threads are completely frozen ! Adding 2 GB of RAM on the server seems to have solved this problem... Thanks all for your help and advises, Thierry -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev