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P10000 interesting behavior with remote copy

MR Dorobantu Dragos
Frequent Advisor

P10000 interesting behavior with remote copy

 

We have two 3par V400. We create a remote copy replication group for one disk.

Tests for replication links are attached.

 

If we test the disk with Crystal Disk Mark with Windows 2003 we obtain:

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

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

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

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

 

           Sequential Read :   250.976 MB/s

          Sequential Write :    41.326 MB/s

         Random Read 512KB :   119.629 MB/s

        Random Write 512KB :    55.892 MB/s

    Random Read 4KB (QD=1) :     3.719 MB/s [   907.9 IOPS]

   Random Write 4KB (QD=1) :     1.128 MB/s [   275.4 IOPS]

   Random Read 4KB (QD=32) :   204.851 MB/s [ 50012.3 IOPS]

  Random Write 4KB (QD=32) :    34.534 MB/s [  8431.1 IOPS]

 

  Test : 1000 MB [C: 76.8% (23.0/30.0 GB)] (x1)

  Date : 2012/03/14 9:15:29

    OS : Windows Server 2003 R2 Enterprise Edition SP2 [5.2 Build 3790] (x86)

 

If we stop the replication and do the test again we obtain:

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

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

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

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

 

           Sequential Read :   338.687 MB/s

          Sequential Write :   190.494 MB/s

         Random Read 512KB :   187.277 MB/s

        Random Write 512KB :   156.946 MB/s

    Random Read 4KB (QD=1) :     6.564 MB/s [  1602.6 IOPS]

   Random Write 4KB (QD=1) :     4.204 MB/s [  1026.3 IOPS]

   Random Read 4KB (QD=32) :   216.928 MB/s [ 52960.8 IOPS]

  Random Write 4KB (QD=32) :    57.501 MB/s [ 14038.4 IOPS]

 

  Test : 1000 MB [C: 76.8% (23.0/30.0 GB)] (x1)

  Date : 2012/03/14 9:07:43

    OS : Windows Server 2003 R2 Enterprise Edition SP2 [5.2 Build 3790] (x86)

 

So, I am are very concern about all the writes if replication is started.

 

Has anybody an idea about this behavior?

 

Thanks,

Dragos

 

 

 

P.S. This subject has been edited. - Hp Forum Moderator