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Hi, I’m seeing (have always seen) odd behavior when I first put a filesystem on a newly created RBD volume. I’ve seen this on two different clusters across multiple major Ceph revisions. When I create an RBD volume, map it on a client and then do (for instance) mkfs.xfs on it, mkfs.xfs will just sit there and hang for a number of minutes, seemingly doing nothing. During this time, load on the OSDs (both the CPU usage of
the daemons and actual IO on the disks) will spike dramatically. After a while, the load will subside and the mkfs will proceed as normal. Can anyone explain what’s going on here? I have a pretty strong notion, but I’m hoping someone can give a definite answer. This behavior appears to be normal, so I’m not actually worried about it. It just makes myself and some coworkers go “huh, I wonder what causes that”. ----- Edward Huyer School of Interactive Games and Media Golisano 70-2373 152 Lomb Memorial Drive Rochester, NY 14623 585-475-6651 Obligatory Legalese: The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of,
or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and destroy any copies of this information. |
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