I am trying to use write intent bitmaps on some RAID 1 volumes to reduce the rebuild times in the event of hard resets that cause the md driver to kick members out of my arrays.
I used the mdadm --grow /dev/md0 --bitmap=internal and this appeared to succeed, but when I tried to examine the bitmap I get an error.
:~$ sudo mdadm --grow /dev/md0 --bitmap=internal
:~$ sudo mdadm -X /dev/md0
Filename : /dev/md0
Magic : 00000000
mdadm: invalid bitmap magic 0x0, the bitmap file appears to be corrupted
Version : 0
mdadm: unknown bitmap version 0, either the bitmap file is corrupted or you need to upgrade your tools
cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda5[0] sdb5[1]
7823552 blocks [2/2] [UU]
bitmap: 29/239 pages [116KB], 16KB chunk
unused devices: <none>
sjackson@mercuryst5:~$ sudo mdadm -X /dev/md0
Filename : /dev/md0
Magic : 00000000
mdadm: invalid bitmap magic 0x0, the bitmap file appears to be corrupted
Version : 0
mdadm: unknown bitmap version 0, either the bitmap file is corrupted or you need to upgrade your tools
Do I really have a usable bitmap on the device in this case?
Thanks for any input.
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