3 steps with Linux mdraid


a) Notice one NFS Mount from Fileserver ain’t working any more, and the idiotic Debian VM of course locked up instead of doing something graceful where it lost a non-root disk. Instead of listening to music on your morning coffee you’re now looking at a full-scale data loss?

b) Notice the following kernel message on the host

raid10_make_request bug: can't convert block
across chunks or bigger than 64K

Find out you’re hit by https://bugzilla.redhat.com/show_bug.cgi?id=224077

Make it “work again” by using tap:aio and remain a little puzzled. Doesn’t Xen always break IOs into 64K chunks?

3) Stop wondering. Hit ebay and order a Dell Perc5 or Perc6.

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