[svlug] LVM Logical Volumes viewing partitions, mounting, creating, sda moved to sdb. KUbuntu 10.4

[Mark Weisler]

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giovanni_re wrote:
> I got no answer on the Ubuntu mail list about this.  Maybe you know? :)
> 
> =
> KU 10.4.  Desktop with2 hdisks. 1.5TB has 9.04, was hda/sda. Now install a 2TB as sda, move old disk to sdb.
> 
> Alternate install 10.4 on the 2TB sda.  Grub finds the 9.04 install on sdb, & installs fine on sda.
> 
> Both installs have a /home partition in their sda4 logical partition, probably sda5 on each drive when they were installed.
> 
> 10.4 boots fine on the 2tb, but 9.4 refuses to boot off now sdb. 
> 
> Less important question:  Suggestions for getting the 9.4 to boot when that drive has been moved from sda to sdb (data connector on the motherboard).  It's probably a mount issue? 
> 
> 
> ==  How does one see the logical partitions??
> 
> fdisk -l, & parted -l, & gparted, I have used - a few days ago, so I don't recall the specifics right now.
> 
> IIRC, on 9.04 as sda, gparted would see the LVs, & show some info about them.
> 
> When I boot 10.4, IIRC gparted doesn't pull up any info about the LV's, even on the sda drive with the 10.4 os it booted from. :(
> 
> IIRC, none of those programs show info about the LV's on sdb, which has the 9.4 install on it.
> 
> So, is LVM properly supported in some partition creation/diagnostic sw??? ex: fdisk, parted, gparted?  Is there some other program that will at least see, & perhaps show some info about those partitions?
> 
> How about creating more LVs in the free space on the drives?  What sw can do that from the running 10.4 system? (ie, I don't want to have to use the alternate installer disk to do partitioning, now that the os is installed.  I'm hoping that is possible - hasn't LVM been out for quite a while?  Why don't fdisk & parted support it properly yet?  BTW, what orgs create & support the LVM sw? GNU? Linux Kernel?? Other?
> 
> ==
> Most Important:  How can I get 10.4 to be able to see & mount the 9.4 /home partition which is now on (probably) sdb5?  What info will be needed by the mount command? UDEV #?  What sw (parted, fdisk,???) will show the info necessary to use in the mount commnad??

Here's a little more information showing the use of fdisk to set some
parameters for a partition.
Note the '8e' hex specification for 'Linux LVM'. 'fd' is being used here
to set up RAID.

'83' is what we typically use for non-LVM Linux work.



[root at server1 ~]# fdisk /dev/sdb

Command (m for help): <- m
Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the dos compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

Command (m for help): <- t
Partition number (1-4): <- 1
Hex code (type L to list codes): <- L

 0  Empty           1e  Hidden W95 FAT1 80  Old Minix       be  Solaris boot
 1  FAT12           24  NEC DOS         81  Minix / old Lin bf  Solaris
 2  XENIX root      39  Plan 9          82  Linux swap / So c1
DRDOS/sec (FAT-
 3  XENIX usr       3c  PartitionMagic  83  Linux           c4
DRDOS/sec (FAT-
 4  FAT16 <32M      40  Venix 80286     84  OS/2 hidden C:  c6
DRDOS/sec (FAT-
 5  Extended        41  PPC PReP Boot   85  Linux extended  c7  Syrinx
 6  FAT16           42  SFS             86  NTFS volume set da  Non-FS data
 7  HPFS/NTFS       4d  QNX4.x          87  NTFS volume set db  CP/M /
CTOS / .
 8  AIX             4e  QNX4.x 2nd part 88  Linux plaintext de  Dell Utility
 9  AIX bootable    4f  QNX4.x 3rd part 8e  Linux LVM       df  BootIt
 a  OS/2 Boot Manag 50  OnTrack DM      93  Amoeba          e1  DOS access
 b  W95 FAT32       51  OnTrack DM6 Aux 94  Amoeba BBT      e3  DOS R/O
 c  W95 FAT32 (LBA) 52  CP/M            9f  BSD/OS          e4  SpeedStor
 e  W95 FAT16 (LBA) 53  OnTrack DM6 Aux a0  IBM Thinkpad hi eb  BeOS fs
 f  W95 Ext'd (LBA) 54  OnTrackDM6      a5  FreeBSD         ee  EFI GPT
10  OPUS            55  EZ-Drive        a6  OpenBSD         ef  EFI
(FAT-12/16/
11  Hidden FAT12    56  Golden Bow      a7  NeXTSTEP        f0
Linux/PA-RISC b
12  Compaq diagnost 5c  Priam Edisk     a8  Darwin UFS      f1  SpeedStor
14  Hidden FAT16 <3 61  SpeedStor       a9  NetBSD          f4  SpeedStor
16  Hidden FAT16    63  GNU HURD or Sys ab  Darwin boot     f2  DOS
secondary
17  Hidden HPFS/NTF 64  Novell Netware  b7  BSDI fs         fd  Linux
raid auto
18  AST SmartSleep  65  Novell Netware  b8  BSDI swap       fe  LANstep
1b  Hidden W95 FAT3 70  DiskSecure Mult bb  Boot Wizard hid ff  BBT
1c  Hidden W95 FAT3 75  PC/IX
Hex code (type L to list codes): <- fd
Changed system type of partition 1 to fd (Linux raid autodetect)

Command (m for help): <- t
Partition number (1-4): <- 2
Hex code (type L to list codes): <- fd
Changed system type of partition 2 to fd (Linux raid autodetect)

Command (m for help): <- w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
[root at server1 ~]#



- --
Mark Weisler
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