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expanding rdm lun
i need to expand a rdm lun. it is currently mapped to the vm. when i go to unisphere, i created another new lun from the same raid group. then ran the expand wizard on the old lun, but it did not see any luns to expand to.
any idea?
tdubb123
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July 2nd, 2012 18:00
striped or concat. neither one brings up the new lun i created as an available lun.
I am trying to use the migrate wizard instead
but got this
The destination LUN is larger than the source. Performing this operation will increase the size of your LUN. Please verify that any hosts attached to this volume can handle dynamic changes to volume size.
source lun is 50gb
destination lun is 150gb
dynamox
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July 2nd, 2012 18:00
don't know of another way to migrate to larger LUN, MetaLUN should work. Use concat and the target LUN should be availabe in the list.
dynamox
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July 2nd, 2012 18:00
what kind of expansion are you trying to do ? It's not recommended to do an striped expansion where component LUNs reside in the same raid group.
tdubb123
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July 2nd, 2012 18:00
the migration takes too long. is there a better way to migrate a 50gb rdm lun to a 150gb rdm lun?
sgtserge1
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July 3rd, 2012 00:00
Another way could be create a new larger lun, attach to server and then use EMcopy to perform a file level copy or OpenMigrator to perform a volume level copy (in the end you have to expand the volume).
S.
tdubb123
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July 3rd, 2012 07:00
yes that works. thank you. so metalun across rgs gives better performance over single rg?
dynamox
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July 3rd, 2012 07:00
yes, mode spindles at work ..just remember not to create striped MetaLUNs where component LUNs share same RG
sgtserge1
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July 3rd, 2012 07:00
They have to be the same number of blocks.
S.
tdubb123
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July 3rd, 2012 07:00
how identical do they have to be in size?
lun1 is 119.587
lun2 is 120
but it does not work
tdubb123
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July 3rd, 2012 07:00
when i create lun1 from rg1 and a lun2 from rg2.
then i try to expand lun1, concat shows lun2 available, but striping does not show lun2 available.
why is that?
dynamox
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July 3rd, 2012 07:00
lun2 has to be identical size as lun1 for striped expansion.
dynamox
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July 3rd, 2012 07:00
identical match
run this command on lun1 and note the size in blocks, create lun2 and use blocks to specify the size
naviseccli -h getlun lun1
dynamox
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July 3rd, 2012 08:00
White Paper: EMC CLARiiON MetaLUNs A Detailed Review
tdubb123
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July 23rd, 2012 16:00
is it better to create metalun from same bus different enclousure. or different bus different enclousure?
dynamox
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July 23rd, 2012 18:00
Clariion or VNX ?