[linux-lvm] lvm with gpt partitioning?

Wed Oct 16 02:39:23 UTC 2002

On Tue, Oct 15, 2002 at 11:14:25AM -0400, Josh Duncan wrote:
>Hi Luca,
>
>this may sound stupid, but if there is a dos-compatibility partition, why
>doesn't it show up in fdisk or parted?
>
in fdisk it does show:
/dev/sda1             1      4428  35566479+  ee  EFI GPT
parted supports GPT labels and prefers those, so it shows correct
info...

i should have said MBR-compatibility partition, but i prefer referring
to DOS, just to show the idiocy of still having this kind of junk in
A.D. 2002.

kernel does also get GPT info, the problem as heinz pointed out in his
message is in LVM tools (i believe in pv_get_size_ll function), which
does not handle GPT paartitions at all.
[ note i believe we can try putting 0 in part.sys_ind for efi parts or
change pvcreate and every other place this info is used ]
but probably Heinz suggestion of zeroing the damned PC MBR is sound,
I believe the EFI firmware looks for an efi label not for a PC MBR to
find the blasted first vfat partition.

Anyway, if your final desired result is having everithing on lvm on md,
you probably ought to mirror the first vfat partition as well, or at
least copy it on the second device, to be able to boot in case of disk
failure.
so you will end up with
/dev/sda:
MBR PART
        /dev/sda1             1      4428  35566479+  ee  EFI GPT
GPT PART
1          0.017   1000.016  FAT                               boot, lba
2       1000.017  34732.874  LVM??                             lba, raid

and same thing for sdb

this will fool LVM1, since you'll never try to use as PV the first
partirion.

Regards,
L.

>I've included the info you mentioned below, as well as the info for sda...
>--Josh
>
>> looks like you have both a gpt partition and a compatibility dos-like
>> one. i am missing some info (partition detection logs at boot) output of
>> /proc/partition and lvmdiskscan. and i don't have an ia64 to play with
>> any more. might try modifiyng the partition detection code in the kernel
>> config
>
>[root at one sbin]# dmesg|grep sd
>Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
>SCSI device sda: 71132960 512-byte hdwr sectors (36420 MB)
> sda: sda1 sda2 sda3 sda4
>Attached scsi disk sdb at scsi0, channel 0, id 1, lun 0
>SCSI device sdb: 71132960 512-byte hdwr sectors (36420 MB)
> sdb: sdb1 sdb2
>
>/proc/partitions:
>major minor  #blocks  name rio rmerge rsect ruse wio wmerge wsect wuse running use aveq
>   8     0   35566480 sda 22661 39173 355842 99578 84426 763195 6796456 1992657 0 508375 2093808
>   8     1    1024000 sda1 506 17244 17830 1303 14 26 40 3178 0 1183 4482
>   8     2   17086318 sda2 4662 463 39842 22586 1604 5020 53800 1135352 0 35906 1158022
>   8     3   15360000 sda3 17426 19290 293722 67802 82808 758149 6742616 854132 0 480061 923424
>   8     4    2096128 sda4 3 0 96 23 0 0 0 0 0 23 23
>   8    16   35566480 sdb 285 8353 17020 25452 11 201 424 114 0 25533 25566
>   8    17    2096111 sdb1 9 135 288 6 0 0 0 0 0 6 6
>   8    18   17086464 sdb2 25 165 380 12 7 137 288 35 0 47 47
>
>[root at one sbin]# lvmdiskscan
>lvmdiskscan -- reading all disks / partitions (this may take a while...)
>lvmdiskscan -- /dev/sda1  [      33.92 GB] Primary   [0xEE]
>lvmdiskscan -- /dev/sda2  [      16.29 GB] free whole disk
>lvmdiskscan -- /dev/sdb1  [      33.92 GB] Primary   [0xEE]
>lvmdiskscan -- /dev/sdb2  [      16.29 GB] USED LVM whole disk
>lvmdiskscan -- 2 disks
>lvmdiskscan -- 2 whole disks
>lvmdiskscan -- 0 loop devices
>lvmdiskscan -- 0 multiple devices
>lvmdiskscan -- 0 network block devices
>lvmdiskscan -- 6 partitions
>lvmdiskscan -- 0 LVM physical volume partitions
>
>[root at one sbin]# fdisk -l /dev/sda
>
>Disk /dev/sda: 255 heads, 63 sectors, 4427 cylinders
>Units = cylinders of 16065 * 512 bytes
>
>   Device Boot    Start       End    Blocks   Id  System
>/dev/sda1             1      4428  35566479+  ee  EFI GPT
>
>[root at one sbin]# parted /dev/sda print
>Disk geometry for /dev/sda: 0.000-34732.890 megabytes
>Disk label type: GPT
>Minor    Start       End     Filesystem  Name                  Flags
>1          0.017   1000.016  FAT                               boot, lba
>2       1000.017  17685.874  ext3                              lba
>3      17685.875  32685.874  ext3                              lba
>4      32685.875  34732.874  linux-swap                        lba
>
>[root at one sbin]# df -k
>Filesystem           1k-blocks      Used Available Use% Mounted on
>/dev/sda3             15118728   3718600  10632128  26% /
>/dev/sda1              1023728     10720   1013008   2% /boot/efi
>/dev/sda2             16817896   5019860  10943724  32% /home
>none                    505568         0    505568   0% /dev/shm
>
>
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-- 
Luca Berra -- bluca at comedia.it
        Communication Media & Services S.r.l.
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