Re: performance issue

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On 25.10.2015 21:08, Neil Brown wrote:
mdadm --grow /dev/md0 --bitmap=intermnal --bitmap-chunk=256

 not sure how to specify the chunks size:

[root@alfred ~]# mdadm --grow /dev/md0 --bitmap=internal --bitmap-chunk=256
mdadm: failed to create internal bitmap - chunksize problem.
[root@alfred ~]# mdadm --grow /dev/md0 --bitmap=internal --bitmap-chunk=256M
mdadm: invalid bitmap chunksize: 256M
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