The short answer is, No. Alignment is a performance optimization. A user choosing and provisioning VP does not have the fine-level of control over the LUN with VP needed to align it.
If your workload has the I/O profile that would benefit from alignment, and requires a higher-level, and more deterministic performance than available with VP, a traditional RAID group/LUN should be provisioned.
Thin LUNs cannot be aligned because of the way storage is incrementally allocated from the pool of available storage. Any alignment performed by a file system will have not effect.
The whitepaper EMC CLARiiON Virtual Provisioning in its Thin LUNs section describes how storage is allocated. This paper is available on PowerLink.
jps00
2 Intern
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392 Posts
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October 12th, 2009 06:00
If your workload has the I/O profile that would benefit from alignment, and requires a higher-level, and more deterministic performance than available with VP, a traditional RAID group/LUN should be provisioned.
Dr.diSousa
1 Rookie
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97 Posts
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November 1st, 2009 11:00
Are the thin LUNs aligned?
Thanks in advance.
Dario
jps00
2 Intern
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392 Posts
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November 2nd, 2009 06:00
The whitepaper EMC CLARiiON Virtual Provisioning in its Thin LUNs section describes how storage is allocated. This paper is available on PowerLink.