Disk write time.

From: L, Raghunath (Raghunath) (lraghunath_at_lucent.com)
Date: 11/28/05

  • Next message: spacegoose_at_gmail.com: "Summary: SMC (Solaris Management Console)" 
    To: "'sunmanagers@sunmanagers.org'" <sunmanagers@sunmanagers.org>
Date: Mon, 28 Nov 2005 13:07:58 +0530

    Hi Managers,

    I have done a small expariment with storage to check the time taken for
    creating 1Gb file in

    Location Time taken

    1) /tmp (Memory is the fastest) - 3 seconds
    2) T3+ ( Veiritas managed Vol)- 40 seconds
    3) T3+ ( Not Veritas Vol )-20 seconds
    4) 3510 ( Veritas managed)-40 seconds
    5) Cheethah 10RPM internal disk of V20Z-20 seconds
    6) Internal disk of 4 year old E420 R- 30 seconds

    T3+ and 3510 have raid five+ volumeslicing enabled.
    T3+ has 1GB Cache and 3510 has 2GB cache
    T3+ FC is at 1GBPS and 2GBPS for 3510
    qlogic swithes used here are in serial loop

    If you have SAN or direct attached storage with you can you please try this

    /bin/date;/usr/sbin/mkfie 1024m;/bin/date # this will create a 1Gb file sp
    please make sure you have enough space before trying this.

    I am bit surprised by the time taken by T3+ and 3510 as it looks like it's
    on the slower side compaed to even internal drive of the old server. 

    -- 
Sincerely,
Raghu
SDE Team
<>Fix the problem, not the blame. <>
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