I've used the megaraid / LSI cards in the past and they were pretty good in terms of reliability, but the last one I used was the 328 model, from 4 years ago or so. that one had a battery backup option for the cache, and could go to 128 Meg. We tested it with 4/16 and 128 meg ram, and it was about the same with each, but we didn't do heavy parallel testing either.
Here's the page on the megaraid cards at lsilogic.com: http://www.lsilogic.com/products/stor_prod/raid/ultra320products.html On Sun, 28 Sep 2003, Matt Clark wrote: > 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]) > ---------------------------(end of broadcast)--------------------------- TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
