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Message #143788
[Bug 1446786] Re: Wrong read balance when a drive is write-mostly
[Expired for linux (Ubuntu Precise) because there has been no activity
for 60 days.]
** Changed in: linux (Ubuntu Precise)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1446786
Title:
Wrong read balance when a drive is write-mostly
Status in linux package in Ubuntu:
Expired
Status in linux source package in Precise:
Expired
Bug description:
This bug related to `mdadm` `--write-mostly` option. When we create
SSD for read operation, but want to use HDD to mirror SSD content we
can create RAID-1 with SSD and 'write-mostly' HDD disk.
In Ubuntu kernel there is a bug, which lead to havy read from both SSD
and HDD drives. More over if we add HDD as regular disk and SSD as a
'write-mostly' replica most read operations will go to SSD drive
(which is clear from sources and we have prove it in our setup).
In upstream kernel sources this was already fixed:
https://github.com/torvalds/linux/commit/63a7d0a9160421a23baac407847e484e8488d12a
Could you backport this functionality? - This patch looks safe to
apply as is.
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References