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тАО04-06-2001 12:01 PM
тАО04-06-2001 12:01 PM
Bad block allocation
Thanks.
ray
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тАО04-09-2001 05:25 AM
тАО04-09-2001 05:25 AM
Re: Bad block allocation
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тАО04-09-2001 06:02 AM
тАО04-09-2001 06:02 AM
Re: Bad block allocation
Bad Block Relocation on HA Storage Arrays should be turned OFF. This can be acheived by
'lvchange -r N 'lv_name'
Entries are available to explain this topic further on http://www.dutchworks.nl/htbin/hpsysadmin
which may help you further.
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тАО04-09-2001 10:34 AM
тАО04-09-2001 10:34 AM
Re: Bad block allocation
thanks.
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тАО09-01-2004 10:37 PM
тАО09-01-2004 10:37 PM
Re: Bad block allocation
Thanks
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тАО09-02-2004 01:49 AM
тАО09-02-2004 01:49 AM
Re: Bad block allocation
lvchange -r n /dev/vg##/lvol#
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тАО09-08-2004 01:54 AM
тАО09-08-2004 01:54 AM
Re: Bad block allocation
Bad block relocation is used in system to mark the bad blocks on your media and move the data from them to good area. And then it becomes a reference for system that it should not right to bad blocks.
It is recommended to turn off the bad block on root VG so as to detect disk failure whenever occur.
Whereas on data volume it shall be turned on so as not to loose data.
Please check with EMC what do they do internally with bad blocks.
Regards
Prashant
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тАО09-08-2004 02:46 AM
тАО09-08-2004 02:46 AM
Re: Bad block allocation
Rgds...Geoff
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тАО09-08-2004 02:58 AM
тАО09-08-2004 02:58 AM
Re: Bad block allocation
EMC's old recommendation was to prevent bad block relocation using 'lvchange -r n', but if you check current EMC documentation and/or cases you will find that they now say that bad block relocation should be set to Disabled via 'lvchange -r N'.
The bad block is handled on the EMC frame. Unfortunately I found out the hard way that using 'lvchange -r n' was not the way to go. We did experience a bad block and I ended up with a problem on one of my logical volumes. The DBAs were reporting I/O errors on one of their databases. I confirmed this by checking syslog and then using 'dd' to read the logical volume.
Once I confirmed the I/O errors I opened a case with EMC, but they didn't find anything on the frame. I suspected a bad block issue after I found the 'lvchange -r N' information on EMCs web site, but couldn't confirm until I tried removing and readding the alternate link for the PV this LV resides on. When I tried readding the alternate link I got this error:
PV /dev/dsk/c47t2d7 has the following bad block/s with allocated alternates.
Please run pvcreate [-B] -b and specify these bad blocks before re-running
the command again. Should you wish to override this operation, re-run
the command with the -f argument. In doing so, you may encounter data
corruption.
Bad blocks: 28666504 28666568
Luckily the DBAs had a current backup as I was unable to fix this problem.
David