SANCOPY - Max number of concurrent sessions

Question

Hi,

I am faced with a scenario wherein im required to migrate approx. 20 hosts from one clariion (cx3-80) to another destination clariion via sancopy.

I have successfully managed to do it in the past but then the number of hosts on a single source - destination pair were not high.

Since I have over 20 hosts in this case and these 20 hosts have approx. 200+ luns between them, I would like to know if there is any limit or best practices with respect to the total number of sancopy sessions that can be be concurrently initiated?
I believe between both SPs there can be 16 active sancopy sessions at any point in time and all the remaining sessions will be queued and will resume copy as and when sessions are freed up.
Would there be any issue if I kick off the sancopy data transfer sessions for all the 20 hosts at once i.e for all 200+ luns ?
or Is there some sort of best practices involved here, if so please let me know.

Any help in this regard would be appreciated!

dynamox · Answer

i can't find the exact number of sessions you can have per SP, but i know i've created at least 40 per SP, only 8 sessions per SP at a time were transferring data while the rest were sitting in the queue waiting their turn. Every session you create will require some amount of space on the RLP, that is based on number of source LUNs and their size. So while creating the sessions you might end up not being able to add anymore LUNs to RLP, just play around and see what you get. I did everything via command line. I was pushing from CX600 to DMX3 so first i would create my sessions:

1) NaviSeccli.exe -user Administrator -password password -scope 0 -address 10.1.1.30 sancopy -create -incremental -name Lun546toDMXdev0BAD -srcwwn 60:06:01:60:99:51:0D:00:DE:6A:04:C6:09:49:DA:11 -destwwn 60:06:04:80:00:01:90:10:45:18:53:30:31:39:43:38 -throttle 10 -verify

i used throttle 10 (full speed) and did not have any issues with performance on source, your millage may vary

2) Start session:

NaviSeccli.exe -user Aadmin -password password -scope 0 -address 10.1.1.30 sancopy -start -name Lun546toDMXdev0BAD -copywholelun -nomark all

this will perform the initial copy while host is online

3) Start session again for final sync (host is offline)

NaviSeccli.exe -user Aadmin -password password -scope 0 -address 10.1.1.30 sancopy -start -name Lun546toDMXdev0BAD

4) Terminate session after successful migration

NaviSeccli.exe -user Admin -password password -scope 0 -address 10.1.1.30 sancopy -remove -name Lun546toDMXdev0BAD

kelleg · Answer

Please see the following document about SAN Copy - page 19

SAN Copy

White Paper: EMC CLARiiON SAN Copy - A Detailed Review

http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H2099_SAN_Copy_Knowledgebook_ldv.pdf

For a CX3-80 the maximum concurrent sessions are 16.

glen

CLARiiON

SANCOPY - Max number of concurrent sessions

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