Virtual Block device resize corrupts XFS

Sun Nov 16 13:34:56 CST 2014

Hi,

I am running Centos 7 and have created a virtual block device with ZFS 
(ZVOL). I put XFS onto the block device without partitioning it.

This worked very well as storage disk for a VM.

A few days ago I wanted to increase the size of the block device, but 
accidently decreased it by 1 TB (from 7 to 6). I found out about it and 
immediately increased the size of the drive to 8 TB afterward.

The XFS partition can still be mounted and I can list the files on it, 
but xfs_repair -n says: "/Sorry/, /could not find valid secondary 
superblock"

/Is there the possibility to rescue some files?

kind regards

Markus
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