Re: umount xfs filesystem

[Olaf Weber <olaf@xxxxxxx>]

Daniele Nuzzo writes:

> hi,
> I think I need your advice-opinion ...
> I set up a system like CentOS 5.3, lvm, drbd 8.2, various systems raid
> (Adaptec aacraid or LSI MegaRAID with or without write back cache)
> after some time of work (a few hours or days) do the umount is
> slow... even a few minutes ... why?
> I have already disabled barrier and write cache on drbd, but not on
> the controller or the sas  drives... ideas?
> thanks a lot.

> p.s.
> drbd partitions formatted with the default options.

On unmount the system has flush all dirty data to disk.  Depending on
the amount of data in memory, this might take a while.

I'm not claiming this is definitely the case here, but it is an
obvious candidate.

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