Finding interlace value for RAID-0

For most applications the default value of 16Kb should be sufficient .To tune your stripe for better performance you can adjust this number based on your Disk access profile and average I/O size.

Your "access profile" is how you're accessing disk-- either random I/O (OLTP, webserver, most DB access etc.) or sequential I/O (Disk backups, or DB Full table scans).

If you're tuning for Random I/O, which is more common, then you should size you interlace above your average I/O size.

If you're tuning for Sequential access, you should size your interlace for with the formula:

<Average I/O Size> / <Number of Disks>

See:

http://docsun.cites.uiuc.edu/sun_docs/C/solaris_9/SUNWaadm/LOGVOLMGRADMIN/p5.ht ml

or with a little more info:

http://sunsite.uakom.sk/sunworldonline/swol-09-raid.html

HTH

Aaron Spiegel

aw_spiegel at 2007-7-6 13:08:22 >