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09-16-2009 12:30 AM
09-16-2009 12:30 AM
I have been asked by one of our storage guys to change these settings on Symmetrix SAN Disks
1.Physical volume timeout values will need to be set to 90 rather than the default
2. Bad Block reallocation needs to be set to “none” for SAN disk
Here is an output. The ones with (**) are the ones that need to be changed.
[HA742:root] /root # lvdisplay -v /dev/vg03/lvol1 | grep -v current
--- Logical volumes ---
LV Name /dev/vg03/lvol1
VG Name /dev/vg03
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 6144
Current LE 768
Allocated PE 768
Stripes 0
Stripe Size (Kbytes) 0
Bad block NONE (**)
Allocation strict
IO Timeout (Seconds) default(**)
My question is can these settings be done online or does it require a reboot.
Command syntax to change the above settings would be appreciated.
The host is running HPUX 11.00
[HA742:root] /root # uname -a
HP-UX HA742 B.11.00 A 9000/800 573760598 two-user license
Tks for your help in advance
Solved! Go to Solution.
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09-16-2009 12:54 AM
09-16-2009 12:54 AM
Solutionbad blocks are already off, change the timeout with
/usr/sbin/pvchange [-A autobackup] -t IO_timeout pv_path
and specify the value in seconds. No reboot needed.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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09-16-2009 01:39 AM
09-16-2009 01:39 AM
Re: Symmetrix SAN Disks Managed by HP Volume Manager
What is the command to run if bad block needs to be changed ?
Also, with the IO timeout; silly question.. but do I need to apply the setting to the alternate link disk device as well??
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09-16-2009 01:42 AM
09-16-2009 01:42 AM
Re: Symmetrix SAN Disks Managed by HP Volume Manager
http://docs.hp.com/en/B2355-60127/lvchange.1M.html
Since modern disks and arrays will handle bad blocks the OS will never see such thing, hence this should always be off.
Hope this helps!
Regards
Torsten.
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09-16-2009 01:45 AM
09-16-2009 01:45 AM
Re: Symmetrix SAN Disks Managed by HP Volume Manager
# lvchange -r N /dev/vg_name/lv_name
You don't need to set timeout value on the alternate link.
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09-16-2009 04:01 AM
09-16-2009 04:01 AM
Re: Symmetrix SAN Disks Managed by HP Volume Manager
also you can do it while pv creation
pvcreate -t 90 /dev/rdsk/c#t#d#
(EMC suggests I/O time out to 90.)
You can change it by your value.
for lvols you can do
lvchange -r N /dev/vg03/lvol3
or you can do it while creating a lvol
lvcreate -L 1024 -r N -n lvol3 vg03
Regards,
Awadhesh
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09-16-2009 04:05 AM
09-16-2009 04:05 AM
Re: Symmetrix SAN Disks Managed by HP Volume Manager
For bad blocks
use -r N with lvcreate
for change the timeout value
use pvchange -t 90 /dev/rdsk/cXtXdX
Suraj