Bug#592149: Fwd: mdadm
martin f krafft
madduck at debian.org
Sat Aug 7 20:09:11 UTC 2010
also sprach Florian Heigl <florian.heigl at gmail.com> [2010.08.07.2201 +0200]:
> mdadm came with a cronjob that does a periodic check of the configured arrays.
> this check doesn't limit it's bandwidth or priority and basically it is a DOS
> of the system for the runtime. ping will still work, but even ssh login might
> be delayed beyond the standard timeouts.
>
> the situation is worse with vm's running on top of the affected (host) system.
In my experience, this has never been a problem. But you are not the
first to complain…
> once i tracked down the issue i was able to completely resolve it by changing
> the severity class of the scan to "idle". it continued without very much of a
> slowdown, but the system was perfectly snappy.
Which PID did you iorenice?
> it should be possible to call the verify/resync using ionice to save the hassle
> of tracking the pid.
The verify call is just a write() to the /proc filesystem, the rest
is handled by the kernel. Therefore, iorenice isn't really trivial,
but if there was a single PID to be associated with the verification
run, which I can automatically determine without error, it would be
*much* preferable over the solution suggested in #508123.
Cheers,
--
.''`. martin f. krafft <madduck at d.o> Related projects:
: :' : proud Debian developer http://debiansystem.info
`. `'` http://people.debian.org/~madduck http://vcs-pkg.org
`- Debian - when you have better things to do than fixing systems
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature (see http://martin-krafft.net/gpg/)
URL: <http://lists.alioth.debian.org/pipermail/pkg-mdadm-devel/attachments/20100807/62bf402d/attachment.pgp>
More information about the pkg-mdadm-devel
mailing list