topic Re: Bad Block Pool Relocation in Operating System - HP-UX

Bad Block Pool Relocation

ASO MANUFACTORING — Wed, 17 Dec 2003 17:33:29 GMT

J have to create Logical Volumes on a VA7410 disk . I have to use -r N option as on the EMC or XP model ??
Thanks a lot
Valerio

Re: Bad Block Pool Relocation

James Murtagh — Wed, 17 Dec 2003 17:55:50 GMT

Hi Valerio,

It looks like it - see the following link :

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=lpg35265&prodTypeId=12169&prodSeriesId=89018&locale=en_US

Cheers,

James.

Re: Bad Block Pool Relocation

Ian Kidd_1 — Wed, 17 Dec 2003 21:01:47 GMT

logical volumes on the EMC and the XP arrays should have bad block relocation turned off (-r N) because the hardware itself can perform this action.

Leaving it on can cause erroneous messages to appear in syslog.

Re: Bad Block Pool Relocation

T. M. Louah — Wed, 24 Dec 2003 20:49:46 GMT

Bad Block Reallocation should be turned off, VA array manages the detection and reallocation of bad blocks internally without any intervention from LVM.

Re: Bad Block Pool Relocation

Steven E. Protter — Wed, 24 Dec 2003 23:46:44 GMT

Everyone I've ever spoken to at HP has told me the same thing T. M. Louah posted.

Don't do it. Wouldn't be prudent.

:-)

SEP

Re: Bad Block Pool Relocation

Brian Lee_4 — Sun, 28 Dec 2003 03:33:11 GMT

Bad block reallocation option for logical volumes located in EMC disks needs to be disabled by "lvchange -r N" command.
It prevents OS from reallocating bad blocks.
Bad block reallocation should be done by EMC.
I think that this is required only by EMC disks.
We are using HP XP and Hitachi disks but they don't require the option to be disabled.