dozens of xfsaild threads

[Erik Knight]

Hi there,

We've recently noticed that our system is experiencing extreme performance
problems when running large workloads. The problem seems to come from
excessive System CPU time. Specifically dozens of xfsaild threads. We used
to have SSD drives but recently switched to HDD, so some of us are thinking
that there may be a configuration issue within XFS that is optimized for
SSD but performs terribly slow on HDD.

Can anyone explain what these threads do, what would cause so many of them
to be running simultaneously or consume so much CPU?

Thanks,
Erik
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