On Tue, Nov 03 2015, Rainer Fügenstein wrote: > 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 I guess you have an mdadm version earlier than 3.2 try --bitmap-chunk=262144 which is 256*1024. The number is in K. NeilBrown
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