On Tue, 2007-10-30 at 16:14 +0100, Christian Kujau wrote: > On Tue, October 30, 2007 15:00, Dr.Peer-Joachim Koch wrote: > > we are using jfs on our mail server (cyrus imap). > > So, many small files in lots of directories? How many? > > > Is there a way to improve the performace ? > > Well, there are the usual mountoptions for JFS in the mount(8) manpage, e.g.: > > "nointegrity > Do not write to the journal. The primary use of this option is to allow > for higher performance when restoring a volume from backup media. The > integrity of the volume is not guaranteed if the system abnormally > abends."
You do not want to use this option on a mail server! > > While the backup is working Ican only see ~1MB/sec on the > > SAN switch. The raid is located on a EMC CX700 > > (FC-disks, no ata!). OK it's a old qla2200, but a little > > bit more should be possible. > > Did you rule out the usual bottlenecks (CPU, network I/O)? What does > vmstat/iostat say? How fast is reading from the EMC (from the filesystem > and/or from the device itsself)? You may try creating an external journal on a dedicated disk. This could potentially make writes to the journal (which are done somewhat synchronously) faster. man jfs_mkfs & man jfs_tune for information on how to do this. -- David Kleikamp IBM Linux Technology Center ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Jfs-discussion mailing list Jfs-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jfs-discussion
