> > Thanks. Does TSL still use EVMS? Also why is kernel RAID better than true > > hardware RAID? I would think that true hardware RAID is king (albeit > > pricey.) in terms of performance, reliability, alerting and > > recoverability... incorrect? > > > > I think I should maybe google a bit before asking things like that. > http://linux.yyz.us/why-software-raid.html shows me some good insight and > any other comments on hardware vs kernel RAID appreciated. My choice is to > use or not use the few Adaptec 2940U2W Raid controleers I have.
This page definitely is an excellent reference. If I may share my experience here: we're progressively moving away from hardware RAID. Most of our critical servers were IBM boxes, using IBM's ServeRAID h/w RAID controller (ips). We've had more downtime with these than with the boxes using kernel RAID: firmware bugs taking ages to be fixed, drives suddenly seen as 'defunct' by the controller for no apparent reason (they intensively tested OK on a non-RAID controller), very, *very* little information about what's going on reported by the controller and of course we were locked into using IBM disks only (the controller won't take anything else). Long before that, we had a bunch of Acer servers using the Mylex DAC960. More or less the same story (except having to use only a particular brand of disks). Of course this is just an example. Other h/w RAID controllers might be more reliable, more predictable, but so far I really trust kernel RAID more. I'd use h/w RAID only on machines with extremely high I/O bandwidth requirements. Is the 2940U2W a RAID controller? Greets, _Alain_ _______________________________________________ tsl-discuss mailing list [email protected] http://lists.trustix.org/mailman/listinfo/tsl-discuss
