reiser4 refuses to recover from an image file.

Topics about disk partitioning (fdisk, parted, gparted, partimage), Volumes Management (lvm, evms, dmraid), Storage, file systems, ...
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Joined: 17 Apr 2010, 19:46

reiser4 refuses to recover from an image file.

Post by TTorai » 17 Apr 2010, 20:16


some days ago i have tested if it will (still) work for me to use reiser4 for compressed Partition Backups. And all went well until i tried to recover the backup to the original HDD. ddrescue (dd_rescue and dd too) slowed down to zero bytes/second at around 650000kB while eating 100% CPU Power (single core), and so i was unable to recover the partition image.

I have used the following commands to backup:

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mkfs.reiser4 -o create=ccreg40,compress=lzo1,compressMode=force,cluster=8K /dev/sdb1
mount -o noatime,nodiratime /dev/sdb1 /mnt/backup
mkdir /mnt/backup/Location/
ddrescue /dev/sda1 /mnt/backup/Location/sysresccd-1.5.0_2010-04-14_ddrescue_sda1
And used the following commands to recover:

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mount -o noatime,nodiratime,ro /dev/sdb1 /mnt/backup
ddrescue /mnt/backup/sysresccd-1.5.0_2010-04-14_ddrescue_sda1 /dev/sda1
Copying the backup file from the reiser4 partition to a ext2 partition on another HDD, and recover it from there was successful! IIRC, that way (recovering from reiser4) and some months ago i was able to use the same commands with successful recovery.

Have i done anything wrong?

Now, with SysRescCD 1.52 and the alternate kernel with btrfs (-o compress-force) it works as expected.

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