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Re: [linux-lvm] Major problems after soft raid 5 failure



Hi,

malahal us ibm com wrote:
Colin Faber [cfaber gmail com] wrote:
was unavailable. After searching around I kept coming back to suggestions stating that removal of the missing device from the volume group was the solution to getting thing back online again. So using 'vgreduce --removemissing raid' then 'lvchange -ay raid' to update the changes - Neither command errored and vgreduce noted that 'raid' was not available again.

Since your LV (array) is most likely allocated on md1 that disappeared,
you really want --partial (lvm command) rather than --removemissing.
Your metadata is updated and any knowledge about 'array' LV is now
almost gone due to the above 'vgreduce'. I say almost gone because it
might be there but you really need true LVM expertise now!

Did you save a copy of your old LVM metadata before the reboot? See your
/etc/lvm/backup/raid has any reference to 'array' LV at all.
Yes, it's still there (well /etc/lvm/archive/). So how do I back out of this after I've already run removemissing? If I try and restore the old vg backup it just tells me that it can't restore it because the uuid is missing for md1.

By the way, thank you very much for the response. Any suggestions and help are greatly welcome.

-cf

--Malahal.

So as it stands now I have no logical volume, I have a volume group and I have a functional md0 array. If I dump the first 50 or so megs of the md0 raid array I can see the volume group information, as well as the lv information including various bits of file system information.

At this point I'm wondering can I recover the logical volume and recover this 1.8TB of data.

For completeness here is the results of various display and scan commands:

root Aria:/dev/disk/by-id# pvscan
 PV /dev/md0   VG raid   lvm2 [1.82 TB / 1.82 TB free]
 Total: 1 [1.82 TB] / in use: 1 [1.82 TB] / in no VG: 0 [0   ]

root Aria:/dev/disk/by-id# pvdisplay
 --- Physical volume ---
 PV Name               /dev/md0
 VG Name               raid
 PV Size               1.82 TB / not usable 2.25 MB
 Allocatable           yes
 PE Size (KByte)       4096
 Total PE              476933
 Free PE               476933
 Allocated PE          0
 PV UUID               oI1oXp-NOSk-BJn0-ncEN-HaZr-NwSn-P9De9b

root Aria:/dev/disk/by-id# vgscan
 Reading all physical volumes.  This may take a while...
 Found volume group "raid" using metadata type lvm2

root Aria:/dev/disk/by-id# vgdisplay
 --- Volume group ---
 VG Name               raid
 System ID
 Format                lvm2
 Metadata Areas        1
 Metadata Sequence No  11
 VG Access             read/write
 VG Status             resizable
 MAX LV                0
 Cur LV                0
 Open LV               0
 Max PV                0
 Cur PV                1
 Act PV                1
 VG Size               1.82 TB
 PE Size               4.00 MB
 Total PE              476933
 Alloc PE / Size       0 / 0
 Free  PE / Size       476933 / 1.82 TB
 VG UUID               quRohP-EcsI-iheW-lbU5-rBjO-TnqS-JbjmZA

root Aria:/dev/disk/by-id# lvscan
root Aria:/dev/disk/by-id#

root Aria:/dev/disk/by-id# lvdisplay
root Aria:/dev/disk/by-id#


Thank you.

-cf

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read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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