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Number of data streams

Last post 03-07-2012, 3:49 PM by Vincenzo_Basolino. 5 replies.
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  • Number of data streams
    Posted: 03-07-2012, 11:22 AM

    How do you determine how many data streams you have availabe to you? I have 2 media servers both are fiber channel connected to my SAN with 4 Fiber ports each. My understanding is that each port is dual streamed (?) thus giving me 16 maximum data streams at any one time. I cannot find anything that would confirm or deny this and could really use some help trying to determine how many actual streams I have availabe.

  • Re: Number of data streams
    Posted: 03-07-2012, 2:44 PM

    Start with stream 2x the number of spindles in the mountpath(s)

  • Re: Number of data streams
    Posted: 03-07-2012, 3:04 PM

    From the sending side, or the receiving side?

    What do you mean by spindles? if from the receiving side, these are luns that are multiple disks used to create that lun.

  • Re: Number of data streams
    Posted: 03-07-2012, 3:12 PM

    So if the lun has 5 disks i would set the streams to 10 at first.  From there you can run some performance testing to see if going higher nets any different results.  You could also test 5 to see if any performance difference is experienced. 

  • Re: Number of data streams
    Posted: 03-07-2012, 3:43 PM

    I will test those settings and see if it improves it any. The issue I am having is I have 2 VSA (VM) sub-clients, a full backup on one takes 16-18 hours, the other over 24 hours to complete. I am looking at readers vs streams to see if I can improve this any.

    Thank you for your help so far.

  • Re: Number of data streams
    Posted: 03-07-2012, 3:49 PM

    each reader is a VM.  So if 10 readers are set and there are 10 streams, 10 VMs get backed up in parallel.

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