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
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