This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud
lsof /dev/sdb, doesn't return anything.
[root@jumbo ~]# fsck -fy /dev/sdb fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) fsck.ext4: Group descriptors look bad... trying backup blocks... fsck.ext4: Bad magic number in super-block when using the backup blocks fsck.ext4: going back to original superblock fsck.ext4: Device or resource busy while trying to open /dev/sdb Filesystem mounted or opened exclusively by another program?
fsck.ext4 -p -b <superblock> -B 4096 /dev/sdb
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