I believe that software raid has a historical bias. I use software raid exclusively for my lustre installations here, and have never seen any problem with it. The argument used to be that having dedicated hardware running your raids removed any overhead from the OS having to control them, and that raid in general took too much cpu and memory, but the md stack has been drastically improved since those times (over a decade), and now I see very little evidence of this being a problem.
My argument against hardware raid is that if you lose a controller, you lose the raid completely. Just my 2cents. Jason -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brian O'Connor Sent: giovedì, 24. marzo 2011 03:55 To: [email protected] Subject: [Lustre-discuss] software raid This has probably been asked and answered. Is software raid(md) still considered bad practice? I would like to use ssd drives for an mdt, but using fast ssd drives behind a raid controller seems to defeat the purpose. There was some thought that the decision not to support software raid was mostly about Sun/Oracle trying to sell hardware raid. thoughts? -- Brian O'Connor ----------------------------------------------------------------------- SGI Consulting Email: [email protected], Mobile +61 417 746 452 Phone: +61 3 9963 1900, Fax: +61 3 9963 1902 357 Camberwell Road, Camberwell, Victoria, 3124 AUSTRALIA http://www.sgi.com/support/services ----------------------------------------------------------------------- _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
