Am 01.09.2017 um 00:55 schrieb Robert L Mathews:
On 8/20/17 3:43 AM, Mikael Abrahamsson wrote:
Indeed, but as far as I know there is nothing md can do about this. What
md could do about it is at least present a consistent view of data to
fsck (which for raid1 would be read all stripes and issue "repair" if
they don't match). Yes, this might indeed cause corruption but at least
it would be consistent and visible.
If you set all disks except one as "write-mostly", won't mdadm give you
a consistent view of it because it only reads from a single disk?
you gain nothing when you completly lie to fsck and after that switch
back to normal operations with the other disks part of the game
and it works only on RAID1 and *really* RAID1, otherwise my current
RAID10 would be as fast as hell instead the terrible random lags which
are worser sometimes as before replace two out of 4 disks with a SSD
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