As others have mentioned, you really ought to get battery-backed cache if you're doing any volume of writes. The ability to do safe write-back caching makes an *insane* difference to write performance.
The site you link to also has that for only 15% more money: http://uk.azzurri.com/product/product.cgi?productId=80 No experience with the card(s) I'm afraid. In general though, U320 will only be faster than U160 for large sequential reads, or when you have silly numbers of disks on a channel (i.e. more than 4/channel). If you have silly numbers of disks, then RAID5 will probably be better, if you have 4 disks total then RAID1+0 will probably be better. In between it depends on all sorts of other factors. Bear in mind though that if you *do* have silly numbers of disks then more channels and more cache will count for more than anything else, so spend the money on that rather than latest-and-greatest performance for a single channel. HTH Matt > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Richard > Jones > Sent: 27 September 2003 18:25 > To: [EMAIL PROTECTED] > Subject: [PERFORM] advice on raid controller > > > Hi, i'm on the verge of buying a "MegaRAID SCSI 320-2" raid controller. > I need it to build a db server using 4x ultra320 scsi disks > i'm thinking raid 1+0 but will try with raid5 too and compare > > Does anyone have any experience with this model, good or bad i'd like to > know.. thanks :) > > as seen: > http://uk.azzurri.com/product/product.cgi?productId=188 > > Regards, > Richard. > > PS: whoever mentioned starting a site with raid controller > reviews, excellent > idea - its hard to find decent info on which card to buy. > > > ---------------------------(end of broadcast)--------------------------- > TIP 9: the planner will ignore your desire to choose an index scan if your > joining column's datatypes do not match > ---------------------------(end of broadcast)--------------------------- TIP 2: you can get off all lists at once with the unregister command (send "unregister YourEmailAddressHere" to [EMAIL PROTECTED])
