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Disk Monitor on SGLX

 

Disk Monitor on SGLX

Hi,

We configured a Disk Monitor service for a package. The package and the service are running OK. We did unplug the scsi connector from the node running the package. We got I/O errors but the node did not reboot and the package did not swith over.

How can I do a test to ensure that the disk monitor is working correctly.

thanks,
Nourreddine

8 REPLIES
Steven E. Protter
Exalted Contributor

Re: Disk Monitor on SGLX

Shalom Nourreddine,

In the lab.

Pull or power off a monitored disk, see what the cluster does.

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Steven E Protter
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melvyn burnard
Honored Contributor

Re: Disk Monitor on SGLX

What do the package logs say? whqat about /var/adm/messages?
My house is the bank's, my money the wife's, But my opinions belong to me, not HP!

Re: Disk Monitor on SGLX

Salam Steven,

Our setup is the following :
Two Proliant DL580 nodes with an MSA500 G2 storage. The idea was to unplug the SCSI connector from One node (the primary node for a given package). We since make an advance and discovered that Disk Monitor will work as expected if the monitored device is a partition from the same LUN but outside the control of LVM!

For example :
LUN : /dev/cciss/c1d0
Parttion used as an LVM PV for the package : /dev/cciss/c1d0p1
Partition to monitor : /dev/cciss/c1d0p2 . It is actually a small partition of 100K and not used at all.

If we try monitoring /dev/cciss/c1d0p1, it does not work.

Do you have any explanation to this behavior.
Thanks!

Nourreddine
Serviceguard for Linux
Honored Contributor

Re: Disk Monitor on SGLX

If you don't mind adding the configuration file showing where it is used and the XML file, that would help.

Re: Disk Monitor on SGLX

Hi,

PLease find attached the requested files.
This configuration actually works fine.

But if we try to monitor /dev/cciss/c1d1p2, it does not work at all.

Serviceguard for Linux
Honored Contributor

Re: Disk Monitor on SGLX

Before I look at this I have a couple of basic question. I ask these not knowing your esxperience level.

If this configuration that you've added actually works, and changing to another disk does not, did you go through the process of changing the monitored disk? Specifically, did you delete the XML file? Check the latest doc http://docs.hp.com/en/B9903-90050/B9903-90050.pdf
starting at the bottom pf page 208.

Also, did you re-apply the package?

Re: Disk Monitor on SGLX

We first started with the partition /dev/cciss/c1d1p2 used as an LVM PV. This did not work. When we changed to /dev/cciss/c1d1p1 the disk monitor behaves as expected. Of course we removed the old configuration as mentionned on the above Guide. I think it is an issue with LVM.

Re: Disk Monitor on SGLX

Sorry, I mean /dev/cciss/c1d0p2 and /dev/cciss/c1d0p1 which are obviously on the same LUN. May be it is better to monitor /dev/cciss/c1d0 ? I did not test that.