Karel Zak schreef op 19-08-2016 13:14:
On Thu, Aug 18, 2016 at 10:39:30PM +0200, Xen wrote:
Would someone be will to fix the issue that a Physical Volume from
LVM2 (PV)
when placed directly on disk (no partitions or partition tables) will
not be
This is very unusual setup, but according to feedback from LVM guys
it's supported, so I will improve blkid to support it too.
To provide a little feedback.
What is actually the case is that I am installing Grub2 on the PV which
uses the LVM2 "--bootloaderareasize" option to pvcreate.
This creates a bootloader-area of say 1M with an offset like perhaps
2048 sectors, I don't remember how to get that info, after which then
the extents start.
Oh yes, it is this sort of thing:
physical_volumes {
pv0 {
id = "fEGbBn-tbIp-rL7y-m22b-1rQh-r9i5-Qwlqz7"
device = "/dev/sda" # Hint only
status = ["ALLOCATABLE"]
flags = []
dev_size = 1258287104 # 599,998 Gigabytes
pe_start = 4096
pe_count = 153599 # 599,996 Gigabytes
ba_start = 2048
ba_size = 2048 # 1024 Kilobytes
}
}
Grub would naturally create an MBR signature in the first sector, no
partition table, but bootloader code (boot.img).
The result is this:
5182: libblkid: LOWPROBE: [16] LVM2_member:
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: magic sboff=536, kboff=0
5182: libblkid: LOWPROBE: call probefunc()
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: assigning UUID [superblocks]
5182: libblkid: LOWPROBE: wiper set to superblocks::LVM2_member off=0
size=8192
5182: libblkid: LOWPROBE: assigning TYPE [superblocks]
5182: libblkid: LOWPROBE: <-- leaving probing loop (type=LVM2_member)
[SUBLKS idx=16]
5182: libblkid: LOWPROBE: freeing values list
5182: libblkid: LOWPROBE: chain safeprobe topology DISABLED
5182: libblkid: LOWPROBE: chain safeprobe partitions ENABLED
5182: libblkid: LOWPROBE: reseting partitions values
5182: libblkid: LOWPROBE: --> starting probing loop [PARTS idx=-1]
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: magic sboff=510, kboff=0
5182: libblkid: LOWPROBE: dos: ---> call probefunc()
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: magic sboff=0, kboff=0
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x21e3160
5182: libblkid: LOWPROBE: previously wiped area modified -- ignore
previous results
5182: libblkid: LOWPROBE: zeroize wiper
5182: libblkid: LOWPROBE: reseting superblocks values
5182: libblkid: LOWPROBE: free value UUID
5182: libblkid: LOWPROBE: free value TYPE
5182: libblkid: LOWPROBE: assigning PTUUID [partitions]
5182: libblkid: LOWPROBE: dos: <--- (rc = 0)
5182: libblkid: LOWPROBE: assigning PTTYPE [partitions]
5182: libblkid: LOWPROBE: <-- leaving probing loop (type=dos) [PARTS
idx=3]
And ...that's the real truth of it. I'm sorry, I hadn't realized it
would be due to the bootsector.
When I wipe the bootsector actually it does find LVM2_member.
So I am sorry I didn't mention. The culprit is the Grub2 image.
5261: libblkid: LOWPROBE: [16] LVM2_member:
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: magic sboff=536, kboff=0
5261: libblkid: LOWPROBE: call probefunc()
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: assigning UUID [superblocks]
5261: libblkid: LOWPROBE: wiper set to superblocks::LVM2_member off=0
size=8192
5261: libblkid: LOWPROBE: assigning TYPE [superblocks]
5261: libblkid: LOWPROBE: <-- leaving probing loop (type=LVM2_member)
[SUBLKS idx=16]
5261: libblkid: LOWPROBE: freeing values list
5261: libblkid: LOWPROBE: chain safeprobe topology DISABLED
5261: libblkid: LOWPROBE: chain safeprobe partitions ENABLED
5261: libblkid: LOWPROBE: reseting partitions values
5261: libblkid: LOWPROBE: --> starting probing loop [PARTS idx=-1]
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: gpt: ---> call probefunc()
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: gpt: <--- (rc = 1)
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: ultrix: ---> call probefunc()
5261: libblkid: LOWPROBE: buffer read: off=15872 len=512
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: ultrix: <--- (rc = 1)
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: buffer read: off=28672 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: reuse buffer: off=0 len=1024
pr=0x1c4a0e0
5261: libblkid: LOWPROBE: <-- leaving probing loop (failed=1) [PARTS
idx=11]
5261: libblkid: LOWPROBE: parts: start probing for partition entry
5261: libblkid: LOWPROBE: parts: end probing for partition entry
[nothing]
5261: libblkid: LOWPROBE: partitions probe done [rc=1]
5261: libblkid: LOWPROBE: 0x1c4a0e0: end probe
5261: libblkid: LOWPROBE: zeroize wiper
5261: libblkid: LOWPROBE: returning UUID value
5261: libblkid: TAG: found cache tag head UUID
5261: libblkid: LOWPROBE: returning TYPE value
5261: libblkid: TAG: found cache tag head TYPE
5261: libblkid: PROBE: /dev/sda: devno 0x0800, type LVM2_member
Pretty good debug output, by the way.
Anyway. Thanks to Zdenek Kabelac I found this issue. He knew what was
going on.
Regards.
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