On Wed, 3 Feb 2010, Mikael Abrahamsson wrote:
Am I missing something?
Seems I was, it works properly without bitmap. I first removed the bitmap,
i first grew it to 4 drives while still being raid5, then I added a 6th
drive and did this:
root@swmike-test:~/mdadm-3.1.1# ./mdadm --grow /dev/md0 --level=6 --raid-disks=6
mdadm level of /dev/md0 changed to raid6
mdadm: Need to backup 768K of critical section..
[ 499.564157] raid5: device sdb2 operational as raid disk 0
[ 499.564160] raid5: device sdg operational as raid disk 3
[ 499.564162] raid5: device sde operational as raid disk 2
[ 499.564165] raid5: device sdc operational as raid disk 1
[ 499.564583] raid5: allocated 5265kB for md0
[ 499.592869] 0: w=1 pa=0 pr=5 m=2 a=18 r=5 op1=0 op2=0
[ 499.592873] 3: w=2 pa=0 pr=5 m=2 a=18 r=5 op1=0 op2=0
[ 499.592875] 2: w=3 pa=0 pr=5 m=2 a=18 r=5 op1=0 op2=0
[ 499.592878] 1: w=4 pa=0 pr=5 m=2 a=18 r=5 op1=0 op2=0
[ 499.592881] raid5: raid level 6 set md0 active with 4 out of 5 devices, algorithm 18
[ 499.592883] RAID5 conf printout:
[ 499.592885] --- rd:5 wd:4
[ 499.592887] disk 0, o:1, dev:sdb2
[ 499.592890] disk 1, o:1, dev:sdc
[ 499.592891] disk 2, o:1, dev:sde
[ 499.592893] disk 3, o:1, dev:sdg
[ 500.274685] RAID5 conf printout:
[ 500.274689] --- rd:6 wd:5
[ 500.274691] disk 0, o:1, dev:sdb2
[ 500.274694] disk 1, o:1, dev:sdc
[ 500.274696] disk 2, o:1, dev:sde
[ 500.274697] disk 3, o:1, dev:sdg
[ 500.274699] disk 4, o:1, dev:sdh
[ 500.274705] RAID5 conf printout:
[ 500.274706] --- rd:6 wd:5
[ 500.274708] disk 0, o:1, dev:sdb2
[ 500.274710] disk 1, o:1, dev:sdc
[ 500.274711] disk 2, o:1, dev:sde
[ 500.274713] disk 3, o:1, dev:sdg
[ 500.274715] disk 4, o:1, dev:sdh
[ 500.274716] disk 5, o:1, dev:sdf
[ 500.274764] md: reshape of RAID array md0
[ 500.274768] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
[ 500.274770] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape.
[ 500.274777] md: using 128k window, over a total of 2104448 blocks.
That seems to have worked just fine...
Any reason this doesn't work with a bitmap, and if it doesn't, then
perhaps this should be documented somewhere or at least mdadm should throw
an error message?
--
Mikael Abrahamsson email: swmike@xxxxxxxxx
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