Patrick Spinler wrote: > Adam Witney wrote: > > Hi all, > > > > I am experimenting with a few OS's for my new hardware. I plan to have a > > software RAID5 device for my pgsql data directory. > > > > I have been experimenting with FreeBSD and with Linux, does anyone have any > > thoughts on whether vinum RAID devices are better than Linux software RAID? > > Or vice versa... Or no difference at all? Any gotchas I should bear in mind? > > > > Of interest, there are a number of "old school" dba's of my aquantance > who swear vociferously whenever the words RAID 5 and Database are > mentioned in association with each other. > > According to the theory they expound, a database with any significant > write activity whatsoever should never be on raid 5, but instead be on > raid 0+1. > > I've never had a chance to benchmark a comparison between the two and > draw my own conclusions, but it might be interesting to do so.
I have heard you need +6 disks for RAID5 to be faster than Raid 0+1. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
