Would you be able to help me a bit more on this. I know I need to work on cluster gaurd but when you say mirror from LVM level, is it a OS functionality or a SAN Copy functionality?
You will need to perform export/import and recompile cluster guard because CxTxDx numbers will change. I think it would be so much easier to mirror from LVM level (if host cycle allow), no downtime at all. Simply present Clariion LUNs to HPUX, ioscan, insf ..extend VG and start mirroring logical volumes.
It’s OS functionality. HP-UX has a very nice logical volume manager (LVM) that allows you to mirror logical volume from one physical device to another while the system is up and running. There is some CPU overhead but it runs as low priority task ..i’ve never has any issues mirroring on big HPUX superdomes. Your HPUX system admin should be very familiar with LVM.
not as fast as SanCopy speed but i would rather take it longer to copy in the background and avoid downtime than copy it much faster with SanCopy and then deal with downtime associated with LVM work. One thing to note is that if volume group is in shared mode you can not use "lvextend" command to mirror the data unless you are running HPUX 11v3. If you are still on older version of HPUX, volume group will need to be activated in regular mode and only then you can mirror it. Striped logical volumes can not be mirrored either. Another option to move data on the host side is "pvmove", it's a little slower than "lvextend" but much easier to use.
amediratta
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July 5th, 2010 11:00
Thanks Dynamox,
Would you be able to help me a bit more on this. I know I need to work on cluster gaurd but when you say mirror from LVM level, is it a OS functionality or a SAN Copy functionality?
dynamox
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July 5th, 2010 11:00
You will need to perform export/import and recompile cluster guard because CxTxDx numbers will change. I think it would be so much easier to mirror from LVM level (if host cycle allow), no downtime at all. Simply present Clariion LUNs to HPUX, ioscan, insf ..extend VG and start mirroring logical volumes.
dynamox
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20.4K Posts
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July 5th, 2010 11:00
It’s OS functionality. HP-UX has a very nice logical volume manager (LVM) that allows you to mirror logical volume from one physical device to another while the system is up and running. There is some CPU overhead but it runs as low priority task ..i’ve never has any issues mirroring on big HPUX superdomes. Your HPUX system admin should be very familiar with LVM.
amediratta
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July 5th, 2010 22:00
What kind of performance do you see in such data migration based on LVM? We can take a downtime i.e. no CPU load other than LVM.
dynamox
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July 6th, 2010 04:00
not as fast as SanCopy speed but i would rather take it longer to copy in the background and avoid downtime than copy it much faster with SanCopy and then deal with downtime associated with LVM work. One thing to note is that if volume group is in shared mode you can not use "lvextend" command to mirror the data unless you are running HPUX 11v3. If you are still on older version of HPUX, volume group will need to be activated in regular mode and only then you can mirror it. Striped logical volumes can not be mirrored either. Another option to move data on the host side is "pvmove", it's a little slower than "lvextend" but much easier to use.
SKT2
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July 6th, 2010 07:00
another thing to consoder is the quorum disk. You are lucky if you have the quorum server setup instead