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Zepp
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Joined: 15 Mar 2004
Posts: 1246
Location: Ontario, Canada
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 Posted: Tue May 29, 2007 4:56 am Post subject: LVM unkown device after installing new HDD |
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I installed a new HDD and now one of the PVs in my VG can't be found. When I run pvscan it shows up as "unkown device" with the uuid of the missing PV so I am positive this is the drive. I think the device name may have changed after adding the new hdd as well, I don't know if this would cause the problem but how do I get it to recognize the old drive again.
| Code: | # pvscan
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
PV unknown device VG main lvm2 [298.06 GB / 0 free]
PV /dev/sda8 VG main lvm2 [136.88 GB / 0 free]
PV /dev/hda1 VG main lvm2 [57.25 GB / 0 free]
Total: 3 [492.19 GB] / in use: 3 [492.19 GB] / in no VG: 0 [0 ]
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| Code: | # vgscan
Reading all physical volumes. This may take a while...
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find all physical volumes for volume group main.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find all physical volumes for volume group main.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find all physical volumes for volume group main.
Couldn't find device with uuid 'Np9mRZ-KcuF-CybD-Y9Jw-2ZEY-HTKf-WyemVO'.
Couldn't find all physical volumes for volume group main.
Volume group "main" not found
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embobo
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Joined: 19 May 2003
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| Posted: Tue May 29, 2007 6:10 pm Post subject: |
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| When you installed the new HDD did you remove the drive with the PV that is now missing? |
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Zepp
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Location: Ontario, Canada
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| Posted: Tue May 29, 2007 9:35 pm Post subject: |
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| embobo wrote: | | When you installed the new HDD did you remove the drive with the PV that is now missing? |
No it is still connected. I think it's device name was possibly renamed though, its /dev/sdc now but I THINK it might have been /dev/sdb before (/dev/sdb is now the new blank HD I just added) |
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embobo
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| Posted: Tue May 29, 2007 10:12 pm Post subject: |
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| Zepp wrote: | | embobo wrote: | | When you installed the new HDD did you remove the drive with the PV that is now missing? |
No it is still connected. I think it's device name was possibly renamed though, its /dev/sdc now but I THINK it might have been /dev/sdb before (/dev/sdb is now the new blank HD I just added) |
Perhaps you should take out the new drive and see what happens. There may be some odd hardware issue.
Otherwise, run "fdisk -l /dev/sdc" and then for each partition run "pvdisplay /dev/sdcX" where X in the parition number, looking for the correct uuid.
Also, make sure you have the partition id set correctly "8e - Linux LVM". Maybe pvscan relies on the partition id when scanning.
Finally, you may need to delete the cache file (usually /etc/lvm/.cache; see /etc/lvm/lvm.conf). |
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Zepp
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Location: Ontario, Canada
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| Posted: Tue May 29, 2007 10:58 pm Post subject: |
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| Disconnecting the new drive made it "work" again and now the missing drive appears as /dev/sdb like before. I am pretty sure the change in device names is confusing lvm, can I not try and force udev to assign the new drive /dev/sdc and let the older drive keep /dev/sdb? btw I tried deleting the cache and change the type flags of the partitions and none of those helped. |
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embobo
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| Posted: Tue May 29, 2007 11:46 pm Post subject: |
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| Zepp wrote: | | Disconnecting the new drive made it "work" again and now the missing drive appears as /dev/sdb like before. I am pretty sure the change in device names is confusing lvm, can I not try and force udev to assign the new drive /dev/sdc and let the older drive keep /dev/sdb? btw I tried deleting the cache and change the type flags of the partitions and none of those helped. |
That probably won't be easy because the the initial ram disk is where the /dev/sd* entries are created.
You could connect try swapping the physical connections between the old and new drives.
Were you able to locate the pv running pvdisplay on /dev/sdcX? Could you post the output of fdisk -l /dev/sdc? |
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Zepp
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Location: Ontario, Canada
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| Posted: Wed May 30, 2007 12:36 am Post subject: |
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| embobo wrote: | | Zepp wrote: | | Disconnecting the new drive made it "work" again and now the missing drive appears as /dev/sdb like before. I am pretty sure the change in device names is confusing lvm, can I not try and force udev to assign the new drive /dev/sdc and let the older drive keep /dev/sdb? btw I tried deleting the cache and change the type flags of the partitions and none of those helped. |
That probably won't be easy because the the initial ram disk is where the /dev/sd* entries are created.
You could connect try swapping the physical connections between the old and new drives.
Were you able to locate the pv running pvdisplay on /dev/sdcX? Could you post the output of fdisk -l /dev/sdc? |
no the pvdisplay didn't work while it was connected I recall, or at least providing nothing new or revealing. and fdisk -l /dev/sdc just outputs the one partition /dev/sdc1 that occupies the whole disk and is now of type Linux LVM
I guess I can try and rearrange the damn cables but was hoping i could avoid that :/ |
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embobo
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| Posted: Wed May 30, 2007 2:58 am Post subject: |
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| Zepp wrote: | no the pvdisplay didn't work while it was connected I recall, or at least providing nothing new or revealing. and fdisk -l /dev/sdc just outputs the one partition /dev/sdc1 that occupies the whole disk and is now of type Linux LVM
I guess I can try and rearrange the damn cables but was hoping i could avoid that :/ |
I'm out of suggestions:  If pvdisplay /dev/sdc1 doesn't show anything then I don't know what
is happening. |
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Zepp
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Joined: 15 Mar 2004
Posts: 1246
Location: Ontario, Canada
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| Posted: Wed May 30, 2007 3:05 am Post subject: |
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| embobo wrote: | | Zepp wrote: | no the pvdisplay didn't work while it was connected I recall, or at least providing nothing new or revealing. and fdisk -l /dev/sdc just outputs the one partition /dev/sdc1 that occupies the whole disk and is now of type Linux LVM
I guess I can try and rearrange the damn cables but was hoping i could avoid that :/ |
I'm out of suggestions: If pvdisplay /dev/sdc1 doesn't show anything then I don't know what
is happening. |
Ya I can't remember the exact output. I'll try switch the two sata ports and see if it re-orders them and fixes it if. If not I'll run the command again and post the output  . |
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