[linux-lvm] lvm2 raid volumes

[Heinz Mauelshagen]

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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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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