topic Re: external disk array in Operating System - HP-UX

external disk array

navin — Sat, 16 Aug 2008 21:34:41 GMT

Hello All,
I have a hp server and has external disk array.Looks likem for maintenance ..the disk array power source will be down for a while . I would like to know what steps i need to follow to bring the disk array power down / up safely. I do not want the data to be corrupted on that drives if power goes down.
please advice
thanks

Re: external disk array

Patrick Wallek — Sat, 16 Aug 2008 22:36:25 GMT

Since you didn't mention the TYPE of disk array, here are the general steps to follow:

1) Determine what file systems are on the disk array
2) Determine what applications use those file systems
3) Shutdown those applications
4) Unmount those file systems
5) Deactivate the volume groups that house the logical volumes for those file systems
6) Shut down the disk array with the appropriate commands.

When power is restored:

1) Power up the disk array
2) Run an ioscan to verify the disks are visible (ie. everything is CLAIMED and not NO_HW)
3) Activate the VGs
4) Mount the file systems
5) start your applications

Re: external disk array

navin — Sat, 16 Aug 2008 22:46:23 GMT

Thanks much.
As an alternative..can the system be shutdown and power down the diskarray and vice versa to power up .
thanks so much

Re: external disk array

Patrick Wallek — Sun, 17 Aug 2008 01:17:55 GMT

Yes, that would work as well.

Re: external disk array

Deepak Kr — Sun, 17 Aug 2008 03:47:30 GMT

Hi Navin,

It is safer to shutdown servers after taking required approval and then proceed for the power shutdown of array.

If no data access request will be there then no chance of data corruption due to sudden power failure.

regds....DK