Hi Denis, Changing the number of parity disks (RAID5 = 1, RAID6 = 2) doesn't change the math on the data disks and data segment size. You still need a power of 2 number of data disks to insure that the product of the RAID chunk size and the number of data disks is 1MB.
Aside from that; I wouldn't comfortably rely on RAID5 to protect my data at this point. We've seen to many dual-disk failures to trust it. Thanks. -Ed Charland, Denis wrote: > Brian J. Murrell wrote: > >> On Tue, 2010-10-19 at 21:00 -0400, Edward Walter wrote: >> >> >> This is why the recommendations in this thread have continued to be >> using a number of data disks that divides evenly into 1MB (i.e. powers >> of 2: 2, 4, 8, etc.). So for RAID6: 4+2 or 8+2, etc. >> >> > > What about RAID5? > > Denis > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss@lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss