New linux & unix installs with old raid/lvm set-up
I have some questions about raid & lvm. I currently have raid 5 set up via mdadm and lvm (lvm2) set up along with it, running on an old Ubuntu Studio (8.10). I need to upgrade (via fresh install) to a more recent (9.10) version of the system but am not sure what steps to take to sync the new OS install with the old raid/lvm set-up. I have an OS hard drive that is separate from my raid/lvm hard drives. I'd like to install Ubuntu Studio, Solaris and/or OpenBSD, and another *nix onto the computer. I plan on using Studio for music recording/composing purposes and another unix/linux install for normal computer uses. First things first, I'd like to get Ubuntu Studio 9.10 up and running and also working with the raid/lvm disks. How do I do that?
I have some basic ideas but don't know if I'm missing any steps.
Here are some info on my current set-ups...
# vgscan Reading all physical volumes. This may take a while... Found volume group "vg0" using metadata type lvm2
# vgdisplay --- Volume group --- VG Name vg0 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 6 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 931.52 GB PE Size 4.00 MB Total PE 238468 Alloc PE / Size 238468 / 931.52 GB Free PE / Size 0 / 0 VG UUID q9qxE4-tp1X-PUZl-cWfE-PGI3-3y4X...
# pvscan PV /dev/md0 VG vg0 lvm2 [931.52 GB / 0 free] Total: 1 [931.52 GB] / in use: 1 [931.52 GB] / in no VG: 0 [0 ]
# pvdisplay --- Physical volume --- PV Name /dev/md0 VG Name vg0 PV Size 931.52 GB / not usable 2.75 MB Allocatable yes (but full) PE Size (KByte) 4096 Total PE 238468 Free PE 0 Allocated PE 238468 PV UUID Xw1LeW-LRbq-Xt0J-0XtR-fEfi-5LBk...
# df -h /dev/mapper/vg0-vault 755G 293G 463G 39% /studio/vault /dev/mapper/vg0-zone 87G 184M 83G 1% /zone /dev/mapper/vg0-nomad 87G 342M 82G 1% /nomad
$ fdisk -l Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000c177d Device Boot Start End Blocks Id System /dev/sdb1 1 60801 488384001 fd Linux raid autodetect Disk /dev/sdc: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000caa62 Device Boot Start End Blocks Id System /dev/sdc1 1 60801 488384001 fd Linux raid autodetect Disk /dev/sdd: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000d3415 Device Boot Start End Blocks Id System /dev/sdd1 1 60801 488384001 fd Linux raid autodetect
$ more /etc/fstab # /etc/fstab: static file system information. # # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc defaults 0 0 # /dev/sda5 UUID=aab73c93-5c74-4252-b2db / ext3 relatime,error s=remount-ro 0 1 # /dev/sda1 UUID=90e2151d-168b-4918-9019 /boot ext3 relatime 0 2 # /dev/sda6 UUID=a8097c76-3754-4c5a-8371 /studio/workspace ext3 relatime 0 2 # /dev/sda2 UUID=30DCC729DCC6 /windows ntfs defaults,umask=007,gid=46 0 1 # /dev/sda7 UUID=43caaa32-d48f-414a-87b7 none swap sw 0 0 # /dev/sda8 UUID=8b3abdfd-a4cb-478d-b84d none swap sw 0 0 /dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0 /dev/vg0/vault /studio/vault xfs rw,noatime 0 0 /dev/vg0/zone /zone ext3 rw,noatime 0 0 /dev/vg0/nomad /nomad ext3 rw,noatime 0 0
For testing purposes (?)...
1. Boot live cd
2. Install mdadm & lvm2 (while running the live cd)
3. Run these commands:
sudo mdadm --assemble
sudo vgchange -a y
Or perhaps more precisely (?) the following, and this is during an actual OS install:
1. Install Ubuntu Studio 9.10 DVD (an alternate, not a "live" disc)
2. Install mdadm & lvm(2)
3. Enter the following commands:
$ sudo mdadm --assemble /dev/md0 --uuid=(???) /dev/sdb /dev/sdc /dev/sdd
$ sudo vgchange -a y
4. Copy old fstab file into new fstab file. (It can be backed up on another disk.)
Where do I get the correct uuid for the mdadm re-assembly command?
Is including that uuid necessary?
Or is the fstab change really necessary?
Or will I need to still do some kind of "modprobe" for mdadm and/or lvm2?
I might be over-thinking some of this, I don't know, but I'd rather over than under-think it.
I'm running a 64-bit system, not sure if that matters here.
Thank you in advance for any help on this!
I'll just reply since no one else has:
Note: My experience the mdadm linux software RAID is limited to recovering NAS devices such as WD MyBook, Synology, etc ...
UNIX was not designed to stop you from doing stupid things, because that would also stop you from doing clever things.
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