Data Centre meets Vacuum Cleaner Post: 303014201

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The Lounge War Stories Data Centre meets Vacuum Cleaner Post 303014201 by gull04 on Wednesday 7th of March 2018 04:10:19 AM

03-07-2018

Registered User

Data Centre meets Vacuum Cleaner

Hi Folks,

I have just spent a couple of days resolving some problems at the remote DR data centre, sorting out the problems caused by the over zealous use of a Vacuum cleaner of all things.

We have a backup server a SUN V480R with a Storedge 3510 and expansion attached which suffered a significant unexplained failure, all tracked back to an ID selector being touched by the nozzle of said vacuum cleaner - it looks like things went as follows over a period of time.

When the array was installed the setup was disks 0-9 were setup as a 10way stripe with disks 10 and 11 as hot standby disks. Over a period of time, a disk in the expansion (disk 3) failed and the and the first available spare (disk 10) built from the surviving mirror.

At this point the situation that existed left us exposed in a way which wasn't really appreciated, in that the one of the arrays had both mirrors of one part of the stripe. That would be the part that had the exposed ID selector switch, the one that the Vacuum Cleaner nozzle could change causing the failure of one whole stripe and one slice of an other stripe. The result as you can imagine was somewhat unpredictable, which is exactly what the Sun manual for the array says.

To add insult to injury the contents of the 3510 array, was the Legato Networker Backup Catalogue from the 24 drive ATL - making the recovery somewhat awkward.

What's the point of the story - don't let some idiot into a data centre with a Vacuum Cleaner.

Regards

Gull04

gull04

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LEARN ABOUT HPUX

pvck

pvck(1M)																  pvck(1M)

NAME

       pvck - check or repair a physical volume in LVM volume group

SYNOPSIS

       pv_path

       pv_path

DESCRIPTION

       This command is supported for arguments belonging to volume groups version 1.0.	Attempting this command with arguments belonging to volume
       groups version 2.0 or higher will result in an error.

       Note: Currently is only capable of detecting bad checksums caused by a forward system migration	after  a  backward  system  migration.	It
       should not be used in other situations.

       The command examines and repairs LVM data structures on a raw disk (pv_path) in a volume group.

   Options and Arguments
       recognizes the following options and arguments.

	      Repair problems found.

	      Report, but do not repair problems.

	      pv_path	The raw device path name of a physical volume.

RETURN VALUE

       returns the following values

	      Either no problems were found or all problems were corrected.

	      Unable to repair.

EXAMPLES

       Examine LVM checksums on without modifying anything:

       Repair LVM checksums on if necessary:

WARNINGS

       should only be run on a device whose volume group has not been activated.

       is designed to repair the root device or devices while the system is booted in maintenance mode ("", see hpux(1M) on PA-RISC systems).

AUTHOR

       was developed by HP.

SEE ALSO

       intro(7), lvm(7).

																	  pvck(1M)