Hi Everyone,
I'm currently reshaping my raid5 array into a raid6 array (by adding a
spare and growing).
Unfortunately I didn't research the nuances before doing so and missed
the opportunity to --layout=preserve.
As a result the array is rebuilding by use of a backup-file, at a rather
slow pace.
md1 : active raid6 sde1[0] sdb1[6] sdh1[5] sdc1[4] sdg1[3] sdd1[2] sdf1[1]
7325679680 blocks super 0.91 level 6, 64k chunk, algorithm 18
[7/6] [UUUUUU_]
[=========>...........] reshape = 47.0% (689413888/1465135936)
finish=4126.9min speed=3132K/sec
I have tried the following so far:
* read ahead tweaking
* stripe_cache_size tweaking (not a limiting factor - mdadm seems to
tune this appropriately)
* running the backup file from dev/shm (only for testing purposes)
The reshape does not seem to be IO or CPU bound, it just seems to be
limited by the sync's and meta data updates to each disk.
Is it possible to increase the buffer/stripes that mdadm process in a
batch to speed up the process (~41m/2 -> 1G) ?
Any thoughts would be appreciated (even to confirm there is nothing to
be done).
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