[Dovecot] Question about "slow" storage but fast cpus, plenty of ram and dovecot

Seth Mattinen sethm at rollernet.us
Mon Dec 13 20:36:51 EET 2010

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?


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