EVA LUNS PVLink Failed! The PV is still accessible

[johnsonpk]

Hi,

Is all the three LUN in that vg from same EVA? What is EVA model? can you compare the PV time out value for all the three LUN (pvdisplay )

PV Name /dev/dsk/c12t0d1
PV Name /dev/dsk/c12t0d2
PV Name /dev/dsk/c12t0d3


your sample log entry shows the culprit as disk /dev/dsk/c12t0d2 .. is there any logs for other pvs ?(look for PVLink 31 0x??0100 and 0x??0300 )
if it is only for the newly added PVs , try increasing the pv timeout values to 90 or 180 ( pvchange -t 180 )

Regards
Johnson

[cam9269]

Hi Johnson,

Yep, all LUNs came from the same EVA (EVA3000)
pvtimeout = 120 for all LUNs.

There are also other PVs generating the error.

Last night I took out these PVs from the VG alternates, and the error stopped.

The question now is, why am I getting the PVlink errors when I use those alternate links? Any ideas?

Thanks!

[johnsonpk]

Hi, you can stop logging those time out error in the syslog by disable pro-active polling for pvs (pvchange -p n )for the time being (better than removing all alternate links). However ,try isolating issues by just adding alternative links from same HBA or add one at a time ...

regards
johnson

[cam9269]

Hi Johnson,

The problem is, when I add these links, they not only create those error messages, but also create very, very high I/O on the system.

The OS is complaining about excessive I/O errors from the device and I think it will create bottlenecks if ever the new space is allocated to an LV.

Is there some documents which discusses LVM stuff in a deeper sense? I need to find out how these things work so that I can it explain better and perhaps put up a solution for the issue.

Thanks!
Chris

[johnsonpk]

Hi Chris,

I am sorry to say that i don't have any .Log a call with HP for better analysis..

It may be because of an issue with specific HBA , HBA firmware, or driver .Try update it with latest patches .(alternatively add link from only one hba and see if it with a particular HBA.

Regard!
Johnson

[Prasanth Thomas]

Hi,

Please let me know the server model,OS and the output of ioscan -fnkC fc

When did u upgrade the pathes (especially HBA) on this server?.
Better you can do a patch assessment on this server and chek. Please fnd the below link to do the same.

http://www13.itrc.hp.com/service/patch/addUpdateSystemsPage.do?BC=main|assess|

Regards,
Prasanth Thomas.