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compression

I am running Windows 2003 R2 ENT EDT.
I have attached 20TB to it. I don't see the compression feature under the general tab of 20TB drive "compress drive to save disk space option not available".

I am running another server with Windows 2003 R2 STD EDT with storage of 10TB, and it allows me to do compression.

Any ideas??

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alisafia
Asked:
alisafia
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1 Solution
 
MarkMichaelCommented:
Have you got any encrypted data on the drive?

You can't have encrypted data on the same drive as compressed data.
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MSE-dwellsCommented:
Compression is only supported by partitions formatted with NTFS using a 4K cluster size.  Run this command from a command prompt (as an Admin) to determine your cluster size -

fsutil fsinfo ntfsinfo c: | find /i "per cluster"

MarkMichael: are you sure?  I've never heard mention of such a restriction ...
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MSE-dwellsCommented:
... perhaps you're referring to the inability to both compress and encrypt the same file?
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MarkMichaelCommented:
... perhaps you're referring to the inability to both compress and encrypt the same file?
--

I am indeed. It was just a stab in the dark either way. Hopefully leading some light on the situation. obviously not :)
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alisafiaAuthor Commented:
C:\Documents and Settings\bkadmin>fsutil fsinfo ntfsinfo e:
NTFS Volume Serial Number :       0x92a8c266a8c24885
Version :                         3.1
Number Sectors :                  0x00000009e2aff7ff
Total Clusters :                  0x0000000013c55fef
Free Clusters  :                  0x0000000013c55962
Total Reserved :                  0x0000000000000000
Bytes Per Sector  :               512
Bytes Per Cluster :               65536
Bytes Per FileRecord Segment    : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length :           0x0000000000010000
Mft Start Lcn  :                  0x000000000000c000
Mft2 Start Lcn :                  0x0000000009e2aff7
Mft Zone Start :                  0x000000000000c000
Mft Zone End   :                  0x0000000002796c00



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alisafiaAuthor Commented:
the cluster size is 65536.
Raid Stripe is 64K

Let me call the Microsoft and I will keep you guys posted?
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MSE-dwellsCommented:
As I said, compression requires 4K clusters ... if the drive has no data, simply reformat.
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alisafiaAuthor Commented:
MSE-dwells:
Yes you are right. Microsoft said it has to be 4K.

http://support.microsoft.com/kb/302873
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alisafiaAuthor Commented:
mikem:

kkrans:

I have already dealt this with the Microsoft tech.

C:\Documents and Settings\bkadmin>fsutil fsinfo ntfsinfo e:
NTFS Volume Serial Number :       0x92a8c266a8c24885
Version :                         3.1
Number Sectors :                  0x00000009e2aff7ff
Total Clusters :                  0x0000000013c55fef
Free Clusters  :                  0x0000000013c55962
Total Reserved :                  0x0000000000000000
Bytes Per Sector  :               512
Bytes Per Cluster :               65536
Bytes Per FileRecord Segment    : 1024
Clusters Per FileRecord Segment : 0
Mft Valid Data Length :           0x0000000000010000
Mft Start Lcn  :                  0x000000000000c000
Mft2 Start Lcn :                  0x0000000009e2aff7
Mft Zone Start :                  0x000000000000c000
Mft Zone End   :                  0x0000000002796c00


compression requires 4K clusters, if I do a format it then it tells me that format count is higher. if i format over 8k then compression is greyed out. if i do format under 8k then i get cluster count is too high.

ref: http://support.microsoft.com/kb/302873

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MSE-dwellsCommented:
Can you be more specific regarding some relevant reference on that page you linked me to.  This isn't something I'm familiar with but that's likely beocause I've never attempted to use compression in production.
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