A customer decides to decompress a LUN that was originally a thin LUN.
What is the result of the decompression?
A.
Thin LUN.
B.
Traditional LUN.
C.
Storage pool Thick LUN.
D.
Private LUN.
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C
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The correct answer is: “C”
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decompress operations
If a LUN being decompressed was originally a thin LUN, the decompressed LUN will remain thin.
So, Answer is “A”
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The decompression process restores compressed data to its original size. When compression is disabled on a compressed LUN, the entire LUN is processed in the background. When the decompression process completes, RAID Group LUNs and Thick LUNs are migrated back to Thick LUNs. Thin LUNs are migrated to a new Thin LUN with a defrag process which might give better performance after the decompression. The LUN, while remaining a thin LUN, is fully allocated to preserve the consumed capacity of the original LUN type.
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Right— A
Product:
VNX Series
Clariion CX4 series
Description:
How decompression work in VNX and Clarrion
Solution:
The decompression process restores compressed data to its original size. When compression is disabled on a compressed LUN, the entire LUN is processed in the background. When the decompression process completes, RAID Group LUNs and Thick LUNs are migrated back to Thick LUNs. Thin LUNs are migrated to a new Thin LUN with a defrag process which might give better performance after the decompression. The LUN, while remaining a thin LUN, is fully allocated to preserve the consumed capacity of the original LUN type.
LUN Migration offers a compelling alternative to decompression. This is an attractive option when a LUN is more active than expected or in anticipation of a known period of high I/O activity. In these cases, in addition to decompressing data, a change in LUN type may be warranted or different physical spindle may be used. All of these changes can be addressed with a single online LUN Migration operation. The user can migrate a compressed LUN to a RAID group LUN or a LUN in another pool for example as long as the target LUN’s user capacity is the same or larger than the compressed LUN’s user capacity.
Also refer to Knowledgebase solution ID emc316185 for more information on the issue.
https://community.emc.com/docs/DOC-21545
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