Activating second disk on ubuntu: Difference between revisions
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* initialize /dev/sdb1? | * initialize /dev/sdb1? | ||
<pre>pvcreate /dev/sdb</pre> | <pre>pvcreate -M2 /dev/sdb</pre> | ||
Unfortunately, I got this back: | |||
<pre> | |||
root@weasel:/# pvcreate -M2 /dev/sdb | |||
Device /dev/sdb not found (or ignored by filtering). | |||
</pre> | |||
* I no longer intend to assign this new disk to the existing volume group. Instead, I'm going to make a different mount point and filesystem for editing video. Hopefully, this will allow me to partition my disk failures. | |||
But I don't plan on making any of these changes until I've slept on it for a few days. | But I don't plan on making any of these changes until I've slept on it for a few days. | ||
Revision as of 23:11, 26 September 2006
I have two disks installed on my ubuntu dapper machine. Each is 250GB. But only one of them appears to be mounted and usable. This has been the case since my initial install of Ubuntu on this machine. I'm not sure how I confused the installer so badly. But I clearly did not understand the subtleties of LVM.
Collected data
root@weasel:/var/log# df -kh
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/Ubuntu-root
224G 87G 125G 42% /
varrun 1007M 208K 1007M 1% /var/run
varlock 1007M 4.0K 1007M 1% /var/lock
udev 1007M 108K 1007M 1% /dev
devshm 1007M 0 1007M 0% /dev/shm
lrm 1007M 22M 986M 3% /lib/modules/2.6.15-26-amd64-k8/volatile
/dev/sda1 228M 102M 115M 48% /boot
Logical volume manager (LVM) has something to do with this.
root@weasel:/var/log# fdisk -l Disk /dev/sda: 250.0 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 31 248976 83 Linux /dev/sda2 32 30401 243947025 5 Extended /dev/sda5 32 30401 243946993+ 8e Linux LVM Disk /dev/sdb: 250.0 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 30401 244196001 8e Linux LVM
The end of the LVM Howto has some common tasks and how to do them. I noticed the pvdisplay command:
root@weasel:/etc/lvm# pvdisplay /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error Couldn't find device with uuid 'Y67lyo-mEdN-F0un-yPLl-HCTa-hWLC-mCentd'. --- Physical volume --- PV Name unknown device VG Name VolGroup00 PV Size 232.78 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 32768 Total PE 7449 Free PE 0 Allocated PE 7449 PV UUID Y67lyo-mEdN-F0un-yPLl-HCTa-hWLC-mCentd --- Physical volume --- PV Name /dev/sdb1 VG Name VolGroup00 PV Size 232.88 GB / not usable 0 Allocatable yes PE Size (KByte) 32768 Total PE 7452 Free PE 2 Allocated PE 7450 PV UUID mh0UHf-UYhT-NOj8-Ddlv-3NVL-hKBW-enhOXu --- Physical volume --- PV Name /dev/sda5 VG Name Ubuntu PV Size 232.64 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 59557 Free PE 0 Allocated PE 59557 PV UUID hzY3In-XHIh-RGwS-1ilj-nL6P-Ajts-KmySkw
There's a volume group display command as well:
root@weasel:/etc/lvm# vgdisplay /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error Couldn't find device with uuid 'Y67lyo-mEdN-F0un-yPLl-HCTa-hWLC-mCentd'. Couldn't find all physical volumes for volume group VolGroup00. /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error Couldn't find device with uuid 'Y67lyo-mEdN-F0un-yPLl-HCTa-hWLC-mCentd'. Couldn't find all physical volumes for volume group VolGroup00. Volume group "VolGroup00" doesn't exist --- Volume group --- VG Name Ubuntu System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 232.64 GB PE Size 4.00 MB Total PE 59557 Alloc PE / Size 59557 / 232.64 GB Free PE / Size 0 / 0 VG UUID 85vnO6-FtRR-SZnS-s0UQ-aFNf-OY5X-ZiwMm0
Physical volume scan (pvscan) shows this:
root@weasel:/etc/lvm# pvscan /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error Couldn't find device with uuid 'Y67lyo-mEdN-F0un-yPLl-HCTa-hWLC-mCentd'. PV unknown device VG VolGroup00 lvm2 [232.78 GB / 0 free] PV /dev/sdb1 VG VolGroup00 lvm2 [232.88 GB / 64.00 MB free] PV /dev/sda5 VG Ubuntu lvm2 [232.64 GB / 0 free] Total: 3 [698.30 GB] / in use: 3 [698.30 GB] / in no VG: 0 [0 ]
Analysis
It looks to me like I have two volume groups named VolGroup00 and Ubuntu. The Ubuntu volume group is working, but the VolGroup00 is not. Device /dev/sda5 is associated with Ubuntu and /dev/sdb1 is associated with VolGroup00.
The cunning plan
I think the steps toward a working configuration are these:
- remove logical volumes in VolGroup00?
lvremove /dev/???
- remove volume group VolGroup00
vgchange -a n VolGroup00 vgremove VolGroup00
The above commands failed with the error that it couldn't find VolGroup00. But it recommended that I could consider using the command: vgreduce --removemissing. I did the following:
vgreduce --test --removemissing VolGroup00 vgreduce --removemissing VolGroup00 vgreduce --test --removemissing VolGroup00
Luckily, my existing data in the Ubuntu volume group is un-destroyed.
Now vgscan says this:
root@weasel:/# vgscan Reading all physical volumes. This may take a while... /dev/evms/lvm2/VolGroup00/LogVol00: read failed after 0 of 4096 at 0: Input/output error Found volume group "VolGroup00" using metadata type lvm2 Found volume group "Ubuntu" using metadata type lvm2
- initialize /dev/sdb1?
pvcreate -M2 /dev/sdb
Unfortunately, I got this back:
root@weasel:/# pvcreate -M2 /dev/sdb Device /dev/sdb not found (or ignored by filtering).
- I no longer intend to assign this new disk to the existing volume group. Instead, I'm going to make a different mount point and filesystem for editing video. Hopefully, this will allow me to partition my disk failures.
But I don't plan on making any of these changes until I've slept on it for a few days.