On Fri, 11 Jun 2010 13:10:23 +0200 John Hendrikx <hjohn@xxxxxxxxx> wrote: > > I would be really interested to find out if my assumption of small numbers > > of bits set is valid. You can find out the number of bits set at any > > instant with "mdadm -X" run on some component of the array. > > > I was interested as well, so I ran this command: > > > mdadm -X /dev/md2 > > and this is the result(??): > > Filename : /dev/md2 > Magic : d747992c > mdadm: invalid bitmap magic 0xd747992c, the bitmap file appears to be > corrupted > Version : 1132474982 > mdadm: unknown bitmap version 1132474982, either the bitmap file is > corrupted or you need to upgrade your tools I stumbled in the same way initially, but then re-read more closely and noticed that Neil said to run it "on some component of the array", e.g. /dev/sdxN, not the array itself -- and that way it worked fine. However as my array sees almost no write load at the moment, I have no useful results to report. -- With respect, Roman
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