Dear LVM-Users,
i am running into a very interesting situation today, that our LVM
metadata is recognized only sometimes. LVM was running fine for some
weeks and now from today on running pvscan 10 times one after another i
get about 4 positive and 6 negative results (its somehow a coincidence
that LVM is recognized).
* WORKING STATE:
server$ pvscan
PV /dev/md2 VG mainvg lvm2 [909.59 GB / 299.59 GB free]
Total: 1 [909.59 GB] / in use: 1 [909.59 GB] / in no VG: 0 [0 ]
* NOT-WORKING STATE:
server$ pvscan
No matching physical volumes found
notice: Same behaviour with vgscan and lvscan.
Our Setup:
* RAID-10 /dev/md2 on /dev/sd[a-d]5
cat /proc/mdstat
Personalities : [raid1] [raid10]
md2 : active raid10 sdb5[1] sda5[0] sdd5[3] sdc5[2]
953778688 blocks 64K chunks 2 far-copies [4/4] [UUUU]
* LVM2 on top of /dev/md2 (no separate lvm partition)
lvm metadata backup is present and it is exactly the same as backups we
did months ago
I will attach the lvm2 metadata file to this message (vg name: mainvg)
WORKING STATE:
server$ pvscan -vv
Setting global/locking_type to 1
File-based locking selected.
Setting global/locking_dir to /var/lock/lvm
Locking /var/lock/lvm/P_global WB
Wiping cache of LVM-capable devices
/dev/sndstat: stat failed: No such file or directory
Wiping internal VG cache
Walking through all physical volumes
/dev/md2: size is 1907557376 sectors
/dev/md2: lvm2 label detected
PV /dev/md2 VG mainvg lvm2 [909.59 GB / 299.59 GB free]
Total: 1 [909.59 GB] / in use: 1 [909.59 GB] / in no VG: 0 [0 ]
Unlocking /var/lock/lvm/P_global
NOT-WORKING STATE:
server$ pvscan -vv
Setting global/locking_type to 1
File-based locking selected.
Setting global/locking_dir to /var/lock/lvm
Locking /var/lock/lvm/P_global WB
Wiping cache of LVM-capable devices
/dev/sndstat: stat failed: No such file or directory
Wiping internal VG cache
Walking through all physical volumes
/dev/md2: size is 1907557376 sectors
/dev/md2: No label detected
No matching physical volumes found
Unlocking /var/lock/lvm/P_global
Any hints?
Where should it look regarding "/dev/md2: No label detected" vs.
"/dev/md2: lvm2 label detected"??
It seems like RAID-10 is not sync'ed well maybe? But, mdstat reports all
disks are up.
Thanks for your help.
Mat
# Generated by LVM2 version 2.02.38 (2008-06-11): Wed Jul 23 13:16:36 2008
contents = "Text Format Volume Group"
version = 1
description = "Created *after* executing 'vgcfgbackup -vvv'"
creation_host = "fileserver.exxs.net" # Linux fileserver.exxs.net 2.6.18-6-xen-686 #1 SMP Sun Feb 10 22:43:13 UTC 2008 i686
creation_time = 1216811796 # Wed Jul 23 13:16:36 2008
mainvg {
id = "mNtCkm-qYPB-RzWY-Kfke-asbD-xMDD-7ABoDq"
seqno = 15
status = ["RESIZEABLE", "READ", "WRITE"]
extent_size = 8192 # 4 Megabytes
max_lv = 0
max_pv = 0
physical_volumes {
pv0 {
id = "nKql7U-MLbt-5Grp-Hrp7-DOwQ-E2fd-R0n4aD"
device = "/dev/md2" # Hint only
status = ["ALLOCATABLE"]
dev_size = 1907557376 # 909.594 Gigabytes
pe_start = 384
pe_count = 232856 # 909.594 Gigabytes
}
}
logical_volumes {
yangc-root {
id = "oSKqz7-2zJK-FXZ3-r79j-mFCS-2oaK-CIIcN7"
status = ["READ", "WRITE", "VISIBLE"]
read_ahead = 3072
segment_count = 1
segment1 {
start_extent = 0
extent_count = 2560 # 10 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 51200
]
}
}
yangc-imap {
id = "maitoY-2pNZ-eJt2-YgbA-QXlh-i7WC-xOSwp2"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 25600 # 100 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 53760
]
}
}
yangc-home {
id = "hI0d5Q-GFRV-D3H1-0IiQ-IU8m-bnXw-LE5jdH"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 20480 # 80 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 79360
]
}
}
test.exxs.net-disk {
id = "CjHEEF-viBE-UHvg-qIhW-Muk1-9m53-2tMH00"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 5120 # 20 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 99840
]
}
}
yangc-backup {
id = "WqcTef-vvW1-2tfa-HbUQ-NBjN-zai2-l3dd2F"
status = ["READ", "WRITE", "VISIBLE"]
segment_count = 1
segment1 {
start_extent = 0
extent_count = 102400 # 400 Gigabytes
type = "striped"
stripe_count = 1 # linear
stripes = [
"pv0", 104960
]
}
}
}
}
_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
