On 08/03/2016 12:49 AM, Steve Dainard wrote:
Hello,
What are the methods for checking/monitoring a RAID LV?
Hi Stev,
see dmeventd (device-mapper monitoring daemon) and read lvm.conf WRT
raid_fault_policy.
dmeventd provides warn or allocate mode allowing to either just warn
about a RAID DataLV
or MetaLV failure or actively repair such failures. You'll find related
messages in the system log.
The Cpy%Sync field seems promising here:
# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert
raid1 test rwi-aor--- 100.00m 100.00
raid6 test rwi-aor--- 108.00m 100.00
The Cyp%Sync field tells you about the resynchronization progress, i.e.
the initial mirroring of
all data blocks in a raid1/10 or the initial calculation and storing of
parity blocks in raid4/5/6.
It should display a percentage value as in:
# lvs -o+devices iscsi
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert Devices
r iscsi rwi-a-r--- 4.00t 0.03
r_rimage_0(0),r_rimage_1(0),r_rimage_2(0),r_rimage_3(0),r_rimage_4(0),r_rimage_5(0)
Do you have a clean installation?
Try reinstalling lvm2 and device-mapper\*
# pvs
PV VG Fmt Attr PSize PFree
/dev/vdb test lvm2 a-- 1020.00m 876.00m
/dev/vdc test lvm2 a-- 1020.00m 876.00m
/dev/vdd test lvm2 a-- 1020.00m 980.00m
/dev/vde test lvm2 a-- 1020.00m 980.00m
/dev/vdf test lvm2 a-- 1020.00m 980.00m
But testing in a VM by removing a disk does not change the output of lvs:
# pvs
WARNING: Device for PV S5xFZ7-mLaH-GNQP-ujWh-Zbkt-Ww3u-J0aKUJ not
found or rejected by a filter.
PV VG Fmt Attr PSize PFree
/dev/vdb test lvm2 a-- 1020.00m 876.00m
/dev/vdc test lvm2 a-- 1020.00m 876.00m
/dev/vdd test lvm2 a-- 1020.00m 980.00m
/dev/vde test lvm2 a-- 1020.00m 980.00m
unknown device test lvm2 a-m 1020.00m 980.00m
# lvs
WARNING: Device for PV S5xFZ7-mLaH-GNQP-ujWh-Zbkt-Ww3u-J0aKUJ not
found or rejected by a filter.
LV VG Attr LSize Pool Origin Data% Meta% Move
Log Cpy%Sync Convert
raid1 test rwi-aor--- 100.00m 100.00
raid6 test rwi-aor-p- 108.00m 100.00
My end goal is to write a nagios check to monitor for disk failures.
You may want to start with the Nagios checkvolmanager plugin...
Heinz
Thanks,
Steve
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