On 12/12/2010 00:49, Stan Hoeppner wrote: > > Since Javier is looking for ways to decrease I/O load on the SAN, not > necessarily increase Dovecot performance, I think putting the index > files on a ramdisk is best thing to try first. It may not be a silver > bullet. If he's still got spare memory to add to this guest, doing both > would be better. Using a ramdisk for the index files will instantly > remove all index I/O from the SAN. More of Dovecot's IMAP I/O is to the > index files than mail files isn't it? So by moving the index files to > ramdisk you should pretty much instantly remove half your SAN I/O load. > This is assuming that Javier currently stores his index files on a SAN LUN. >
Speaking of ramdisk/SSD, has anyone tried a PCIe SSD for indexes? ~Seth
