Alasdair wrote:
>
> On Wed, Aug 20, 2014 at 05:27:52PM +0200, Lentes, Bernd wrote:
> > lvcreate -v -L 45G -n lv_root_snapshot -s vg1/lv_root >>
> > /var/log/update.log 2>&1
>
> > lvcreate Suspending vg1-lv_root (252:0) with filesystem sync with device
> flush
>
> /var/log is presumably part of a filesystem on the same LV that is getting its
> I/O paused for a brief moment while the snapshot is taken.
>
Yes it is. I have just one lv for the whole directory / .
> 1) Run lvm dumpconfig log/activation to double-check this is not set to 1.
log {
verbose=2
syslog=0
file="/var/log/lvm2.log"
overwrite=0
level=5
indent=1
command_names=1
prefix=" "
}
activation {
missing_stripe_filler="/dev/ioerror"
reserved_stack=256
reserved_memory=8192
process_priority=-18
mirror_region_size=512
readahead="auto"
monitoring=1
mirror_log_fault_policy="allocate"
mirror_device_fault_policy="remove"
thin_pool_autoextend_threshold=100
thin_pool_autoextend_percent=20
udev_rules=1
udev_sync=1
}
>
> 2) What filesystem is this and precisely what kernel? (cat /proc/mounts)
FS is ext3, kernel is 3.0.76-0.11-default
vm58820-6:~ # cat /proc/mounts
rootfs / rootfs rw 0 0
udev /dev tmpfs rw,relatime,nr_inodes=0,mode=755 0 0
tmpfs /dev/shm tmpfs rw,relatime 0 0
/dev/mapper/vg1-lv_root / ext3 rw,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,relatime 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620,ptmxmode=000 0 0
debugfs /sys/kernel/debug debugfs rw,relatime 0 0
/dev/vda3 /boot ext3 rw,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered 0 0
fusectl /sys/fs/fuse/connections fusectl rw,relatime 0 0
securityfs /sys/kernel/security securityfs rw,relatime 0 0
none /var/lib/ntp/proc proc ro,nosuid,nodev,relatime 0 0
>
> 3) Try to obtain a stack trace at the point where this locks up e.g.
> echo t > /proc/sysrq-trigger followed by dmesg (or divert your logging of
> kernel messages to a different filesystem outside the snapshot).
>
> Alasdair
the stack trace you find here (~190KB): http://www.filedropper.com/stacktracevm58820-6lvcreate
Strange thing is that it worked now once without system stop. But second time stop again.
Thanks for your help.
Bernd
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