Hi,
I'm looking for advice on tuning the read-ahead cache for an md device...
for example, should I merely set the read-ahead for the md device:
blockdev --setra ### /dev/md2
or should I start touching the individual raid member devices:
blockdev --setra ### /dev/sdc1
blockdev --setra ### /dev/sdd1
blockdev --setra ### /dev/sde1, etc.
I'm not sure about the relation between the two caches.
Also, does the read-ahead cache for the entire md device show-up in
/proc/ or /sys/block/mdX? I of course find the read-ahead for the
individual devices under, for example:
/sys/block/sdc/queue/read_ahead_kb
Many thanks in advance.
Cheers,
-- roy
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