On 30 May 2013 22:23, Dominic Raferd <dominic@xxxxxxxxxxxxxxx> wrote: > I am wanting to (re)set up my raid1 array with 1 SSD partition (/dev/sda2) > and 1 'rust' drive partition (/dev/sdb1) , both 240GB. SSD will also have a > very small ext2 partition mounted as /mnt/sda1 (to hold the write-intent > bitmap file). > > To get the full speed of the SSD for reads and to maximise speed for writes > I plan to use these settings: > > mdadm -C /dev/md0 --level=raid1 -n 2 /dev/sda2 --write-mostly > --write-behind=16384 --bitmap=/mnt/sda1/write-intent-bitmap.file > --bitmap-chunk=256M dev/sdb1 > > Will this work and be optimal? I am not too bothered about the write-intent > bitmap file but it is not optional I think, hence I set a large chunk size, > could or should it be even larger (or smaller)? Similarly I have tried to > set a high write-behind to speed up writes as much as possible - is 16384 > the maximum allowed? > > My system has mdadm 3.2.3 and kernel 3.2.26. > > Any suggestions gratefully received. > > Dominic > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Quick question: Why not a 2 drive "RAID10"? -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
