Re: [zfs-fuse] zdb_blkptr_cb Got error 52 reading [...] [L0 ZFS plain file] sha256 lzjb LE contiguous dedup single size [...]

[Emmanuel Anne]

Wild guess : maybe your virtual machine didn't allow cache control to zfs-fuse, which wouldn't be a big surprise, but in this case you had a warning in syslog, did you check what it said in syslog if it said anything ?

Assuming the error is not from a wild external case (like a crazy process writing random data to the partition), if it's internal (cache control...), then maybe you can get it back by using the

--log-uberblocks option for zfs-fuse, then get the uberblocks txg from syslog, then quit, and try to run it again with the --min-uberblock-txg option, passing some txg taken from syslog.

The idea is to try to skip the latest updates and rollback the filesystem to a previous state. It can work, the option is here for this kind of emergency.

Good luck !

2012/9/10 tntteam <frambourg...@gmail.com>

Hi,

I'm having an issue with zfs-fuse on ubuntu-server 64bits. My zfs datapool name is datapool.

The "zdb datapool status" takes a very long time (and consume a lot of disk) to output a lot of errors I pasted output here : http://dl.free.fr/qCHFlhIXD

It did not happen 3 days ago. I couldn't find on google "error 52" meaning ...

This machine is a virtual machine hosted on a ESXi and datapool is on a single 100GB vmdk.

My ubuntu :

 uname -a
Linux supervision 3.0.0-22-server #36-Ubuntu SMP Tue Jun 12 17:56:20 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"



My ZFS version :

Package: zfs-fuse
New: yes
State: installed
Automatically installed: no
Version: 0.6.9-1build1
Priority: optional
Section: universe/otherosfs
Maintainer: Ubuntu Developers <ubuntu-dev...@lists.ubuntu.com>
Uncompressed Size: 3,854 k
Depends: libaio1, libc6 (>= 2.8), libfuse2 (>= 2.8.1), libssl1.0.0 (>= 1.0.0), zlib1g (>= 1:1.1.4), fuse-utils, lsb-base
Suggests: nfs-kernel-server, kpartx
Conflicts: zfs-fuse
Description: ZFS on FUSE
 ZFS is an advanced filesystem from Sun Microsystems, originally developed for solaris. It provides a number of advanced features, such as live integrity
 checks, atomic updates, atomic snapshots and clones, compression, and much more.

 This package provides an implementation of Sun's ZFS filesystem in userspace, using FUSE.
Homepage: http://zfs-fuse.net





Thanks for any ideas / support.

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