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[SOLVED]ReadyNas Duo v1 on-disk raid format vs. linux mdraid
Hello 2all, My relative had been happy using ReadyNas Duo for about two years till recent month when suddenly things went out wrong without prior warning. He had received a mail from NAS telling ab...
Just FYI: I was able to successfully recover all the data from both HDDs without having to resort to compiling/using custom mdadm on freshly installed CentOS 6 using fuse-ext2 v.0.0.7 compiled from sources.
Tricky part was to force lvm2 into detecting HDD partitions as PVs - default LVM2 configuration filters out from detection partitions which have "linux raid autodetect" type and/or contain mdraid superblock signatures. To turn this behavior off one would have to edit the /etc/lvm/lvm.conf file, find a line saying "md_component_detection = 1" and change it to "md_component_detection = 0". Having this done (make sure your existing mdraid/lvm2 setup wouldn't be messed up with this change - you should know if this is possible and how to avoid it as long as you're geeky enough to use lvm2 :-D) proceed with the usual vgscan/vgchange -ay magic and with luck you would end up with /dev/c/c and /dev/d/d lvm2 block devices become available for mount with fuse-ext2.
Feel free to PM me (or reach by e-mail at mooroon2 (at sign goes here) mail [here is dot] ru) if more details/advices would be needed concerning the "recovering data from ReadyNas Duo using ordinary linux pc" process.
I would like to thank once again all the posters to this topic, provided hints were invaluable.
Tricky part was to force lvm2 into detecting HDD partitions as PVs - default LVM2 configuration filters out from detection partitions which have "linux raid autodetect" type and/or contain mdraid superblock signatures. To turn this behavior off one would have to edit the /etc/lvm/lvm.conf file, find a line saying "md_component_detection = 1" and change it to "md_component_detection = 0". Having this done (make sure your existing mdraid/lvm2 setup wouldn't be messed up with this change - you should know if this is possible and how to avoid it as long as you're geeky enough to use lvm2 :-D) proceed with the usual vgscan/vgchange -ay magic and with luck you would end up with /dev/c/c and /dev/d/d lvm2 block devices become available for mount with fuse-ext2.
Feel free to PM me (or reach by e-mail at mooroon2 (at sign goes here) mail [here is dot] ru) if more details/advices would be needed concerning the "recovering data from ReadyNas Duo using ordinary linux pc" process.
I would like to thank once again all the posters to this topic, provided hints were invaluable.
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