Re: how can we help DSA save money
On 2013-07-22 14:50, Tollef Fog Heen wrote:
> There are practical problems with your suggestions, such as resizing the
> RAID taking a very long time when we add a new disk (you're looking at
> weeks of seriously reduced performance).
That seems like a limitation of software, at one of the lower layers.
I did not mention ZFS until now, because I didn't want limit anyone's
thinking to filesystems. But I did have it in mind all along.
ZFS allows adding drives to an existing pool to increase its capacity
when needed. That does not require a scrub/resync. They could be added
as mirrored pairs somewhat like being able to extend a RAID10. Or you
could add groups of disks at a time, each configured like RAID6.
And ZFS can also take file-level snapshots, which would possibly allow
for a simpler implementation of snapshot.d.o to be based on it...
Regards,
--
Steven Chamberlain
steven@pyro.eu.org
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