On 09/23/2014 09:11 PM, Helmut Tessarek wrote: > On 23.09.14 22:07 , Eric Sandeen wrote: >> but! your raid doesn't have a 64k stripe, so that doesn't apply. > > Yep, that's true, but see below. > >> no geometry because md0 raid1 doesn't export any stripe geometry. > > [root@atvie01s ~]# cat /proc/mdstat > Personalities : [raid1] > md0 : active raid1 sdb1[0] sdd1[1] > 3906784064 blocks super 1.2 [2/2] [UU] > bitmap: 0/30 pages [0KB], 65536KB chunk > > So for some reason it shows a 64k chunk size even for RAID1. > > That was what got me confused. It confuses many people who are new to md RAID1. The above is the *bitmap* chunk size, not the array chunk size. There is no array chunk size for RAID1 as there is no striping. You must have striping to have chunks. With md RAID1 every 4KB page write is simply mirrored to each physical disk. Cheers, Stan _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
