[HPADM] EMC disk filesystem copies transfer rates.

From: Abramson, Stuart (SAbramson_at_Wabtec.com)
Date: 11/13/03

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    To: "Hpux-Admin (hpux-admin@dutchworks.nl)" <hpux-admin@dutchworks.nl>
Date: Thu, 13 Nov 2003 12:12:32 -0500

    Hpux-admins:

    Here's an interesting thing I noticed today timing disk filesystem copies on
    HP-UX servers (a2, a3, a5, w6, etc are UNIX servers):

            Fm NIC FA To: NIC FA: FS SZ Time Speed

            w6 GigE 4a/13a w8 GigE 4a/13a /u413 7.6 24m 19
    GB/hr*
            w7 -- 4a/13a w7 -- 4a/13a /u501 3.4 15m 13
    GB/hr*
            a3 100 3a/14a w7 1000 4a/13a /u78 3.2 8m 24
    GB/hr*
            a2 100 4a/13a w7 1000 4a/13a /u31 3.9 15m 16 GB/hr
            a5 100 3a/14a w7 1000 4a/13a /u31 3.9 8m 29
    GB/hr*

    The fastest copy I get is across the slowest LAN where the FA port
    connections are different.

    The slowest copy I get is on the VERY SAME SERVER. No LAN involvement at
    all. But I'm copying from the same FAs to the same FAs. (And the same HBAs
    to the same HBAs.) I was kind of hoping that the PowerPath would take care
    of this.

    It appears that the HBAs and FAs are the limiting factor here, not the LAN,
    or the disks.

    What do you think? Has anyone done a study of transfer rates on filesystem
    copies?

            Stuart

    Stuart Abramson | Off: 412/825-1434 | Cell: 412/417-1567 | email:
    sabramson@wabtec.com

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