yajtsav
1 Copper

symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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hi all,

could someone explain why some ratio outputs are different?

same command on the same VMAX, but different SE version

thanks a lot

SE9.0

#symcfg -sid xxx list -srp -efficiency

STORAGE RESOURCE POOLS EFFICIENCY

Symmetrix ID  : 000

--------------------------------------------------------------------------

      Overall  Data  Reduction   VP      Snapshot

Name  Ratio    Ratio  Enabled    Ratio    Ratio

-------------------------------- ------- ------- ------- -------- --------

SRP_1 11.3:1   2.5:1     100    1.5:1    22.7:1

SE8.4

#symcfg -sid xxx list -srp -efficiency

STORAGE RESOURCE POOLS

Symmetrix ID  : 000

-----------------------------------------------------------------

Overall SRP Efficiency

     VP    Snapshot   Comp    Overall

Name Ratio    Ratio   Ratio    Ratio

-------------------------------- ------- -------- ------ --------

SRP_1 1.5:1   22.7:1  2.8:1   12.7:1

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Jasonc1
3 Argentium

Re: symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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The reason that SE 9.0 says data ration instead of compression ratio is because SE 9.0 support the Powermax arrays that can perform compression and deduplication. So the data ratio is a combination of compression and dedupe.

If you have a VMAX 250F for example, it only supports compression so the reporting in SE 9.0 will just be the compression calculation.

You can manually calculate the compression ratio if you really want to be sure the reporting is good. I posted a method for this here.

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Jasonc1
3 Argentium

Re: symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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Per the SE V9.0 Release notes, there was a fix to the compression ratio reporting. This may be the cause of the difference.

yajtsav
1 Copper

Re: symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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thanks a lot...so could we get the compression ratio in SE9.0 or should we stay with data ratio now?

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Jasonc1
3 Argentium

Re: symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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The reason that SE 9.0 says data ration instead of compression ratio is because SE 9.0 support the Powermax arrays that can perform compression and deduplication. So the data ratio is a combination of compression and dedupe.

If you have a VMAX 250F for example, it only supports compression so the reporting in SE 9.0 will just be the compression calculation.

You can manually calculate the compression ratio if you really want to be sure the reporting is good. I posted a method for this here.

yajtsav
1 Copper

Re: symcfg -sid xxx list -srp -efficiency output different between SE8.4 and SE9.0

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thanks

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