Chris Samuel wrote:

> Mount times of 30 minutes have been reported for a filesystem that's
> ~82TB large with ~62TB of data.

I wonder how many subvolumes were involved.

It took a bit (2 or 3 seconds) longer when I had a lot of ZFS filesystems to mount (maybe between 50 to 100, I guess now)

It was on 2 TeraByte max so smaller as the reported overall size.

Regards
Peter

On Wed, Jul 29, 2015 at 9:03 PM, Chris Samuel <chris@csamuel.org> wrote:
On Mon, 27 Jul 2015 11:12:52 PM Brian May wrote:

> I believe that the default x-systemd.timeout is 90 seconds. Should be more
> then enough I think. mount -a works much faster.

Mount times of 30 minutes have been reported for a filesystem that's ~82TB
large with ~62TB of data.

One of the Fujitsu developers responded with:

# Quite common, especial when it grows large.
# But it would be much better to use ftrace to show which btrfs
# operation  takes the most time.
#
# We have some guess on this, from reading space cache to reading chunk
# info. But didn't know which takes the most of time.

cheers,
Chris
--
 Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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