Ric Wheeler <rwheeler@xxxxxxxxxx> writes:
> How long would you wait for something like fsck to run to completion
> before you would need to go to back up tapes? 6 hours? 1 day? 1 week
> ;-) ?
Backup? What are backups? :))
A hardware raid6 resync takes about 16h. A Software raid6 (over 6
hardware raid6) resync takes 1-2 days.
With lustre the fsck has to be done on the MDT (meta data target) to
build a database file and on all the OST (object storage target). So
there is some parallelization in the system.
But each OST, if we get ext4 64bit working, would be 28TB. I would
assume days for an fsck run. Weeks would not be good and less than a
day is totaly unrealistic.
But a few days for an fsck of 400-800TB filesystem isn't so
bad. Reading that amount from backup will take ages too, if you even
have one.
MfG
Goswin
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