md11 : active raid6 sdh(S) sdc sdi sdf sde sdk sdj sdd 4883811840 blocks super 1.2 level 6, 512k chunk, algorithm 2 [7/7] [uuuuuuu]
If i now issue 'mdadm /dev/md11 --grow --raid-devices=8 --backup-file=/root/backup_md11.bak' I get
mdadm: this change will reduce the size of the array. use --grow --array-size first to truncate array. e.g. mdadm --grow /dev/md11 --array-size 1565606912
Why would adding a disk REDUCE the size? Am I missing something here? If I add the '--size=max' switch to the command line, i.e. 'mdadm --grow /dev/md11 --raid-devices=8 --level=6 --backup-file=/root/backup_md11.bak --size=max', I get
mdadm: cannot change component size at the same time as other changes. Change size first, then check data is intact before making other changes.
I really don't understand this as the new disk is exactly the same model as the other ones. 'hdparm -I' on the new disk gives me a device size which is identical to the other disks. Has anyone a clue what is going on? Has it something to do with the non-standard chunk-size?
Thanks for helping,