It seems that when you shrank the array a little bit that you chopped off the end of the ext4 filesystem... The raid array is now smaller than the filesystem says it is - hence your error. -- Steven Haigh Email: netwiz@xxxxxxxxx Web: http://www.crc.id.au Phone: (03) 9001 6090 - 0412 935 897 Fax: (03) 8338 0299 > -----Original Message----- > From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid- > owner@xxxxxxxxxxxxxxx] On Behalf Of Konstantin Svist > Sent: Monday, 19 July 2010 10:32 AM > To: linux-raid@xxxxxxxxxxxxxxx > Subject: messed up changing chunk size > > I've been playing around with RAID config and may have finally messed it > up. > > Initially, I created the array with 3 300G drives: > # mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sda4 > /dev/sdb1 /dev/sdc1 > # mkfs.ext4 -v -m 0.01 -E stride=16,stripe-width=32 /dev/md0 > > It's been working nicely so far, and I decided to add a 4th 300G drive: > # mdadm --grow --raid-devices=4 --backup-file=/root/grow_md0.bak > /dev/md0 > > That finished overnight, while I looked around and found that chunk size of > 512 should work better. I unmounted the FS and ran # mdadm --grow -c 512 - > -backup-file=/root/grow_md0_rechunk.bak /dev/md0 > mdadm: component size 293033536K is not a multiple of chunksize 512K > > so I sized it down a bit: > # mdadm --grow -z 293033472 --backup-file=/root/grow_md0_size.bak > /dev/md0 > > and then back to resizing chunks: > mdadm --grow -c 512 --backup-file=/root/grow_md0_rechunk.bak > /dev/md0 > > It's running right now: > # cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] > md0 : active raid5 sdd1[3] sda4[0] sdc1[2] sdb1[1] > 293033472 blocks super 0.91 level 5, 64k chunk, algorithm 2 [4/4] [UUUU] > [====>................] reshape = 22.7% (66540032/293033472) > finish=947.3min speed=3984K/sec > > > But just now I tried to mount the filesystem and it's failing: > EXT4-fs (md0): bad geometry: block count 146516768 exceeds size of device > (73258368 blocks) > > Here's the question, then: am I royally screwed or is my data still there? How > do I recover? > > > > Yes, in retrospect I should've probably checked around whether this > process has been successful for others.. but that's why they say > hindsight is 20/20 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
