also sprach Florian Heigl <[email protected]> [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 <[email protected]> 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
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