On Thu, 13 Sep 2007, Mogens Kjaer wrote: > Tom Diehl wrote: > ... >> They do but nothing I can find in there tells me if it is real hardware >> raid or fake raid. Adaptec for example, also says that their fake raid >> cards >> are comaptable with Linux but they do not clearly specify if it is fake >> raid >> or true hardware Raid. AFAIK the Adaptec cards are all fake Raid. and some >> of >> ServeRaid cards were also based on the Adaptec chipset and hence Fake Raid. > > My IBM x3500 machines have this card: This is the exact machine I am talking about. > # lspci > ... > 03:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02) > ... Hummmm, Interesting!! Maybe my information about Adaptec is wrong. > > I'm not quite sure if this also has an IBM serveraid name. According to the specs I have it is branded as ServeRaid 8k SAS. I do not have the machine yet. > I don't think it is fakeraid; setting up raid devices can take > place at bios level, the buildup of the RAID5 or RAID6 volumes > can run without any drivers loaded. It does not sound like fake raid. > > If this is fakeraid I would like a clear definition of the term > fakeraid. There is a pretty good explaination of fake raid here: http://thebs413.blogspot.com/2005/09/fake-raid-fraid-sucks-even-more-at.html And some more info here: http://linuxmafia.com/faq/Hardware/sata.html All of it is a bit old but mostly still revelent as far as I can tell. Regards, -- Tom Diehl tdiehl at rogueind.com Spamtrap address mtd123 at rogueind.com