From: Pandey, Abhimanyu (apandey@worcester.edu)
Date: Mon Mar 27 2006 - 15:30:38 EST
I got one response from BOB: The CX300 has write cache. The internal
disks do not. What you are seing is expected. Nothing is wrong. The
CX300 writes faster than the internal disks.
i did some more experimenting. (each script is moving a big file from
originatingdisk@destinationdisk.sh)
as you can see moving files from the external SAN disk onto the Server
disks takes much longer than even writing between internal disks
(server2server). is this expected?
thanks,
abhimanyu.
# time ./server2san.sh
0.26u 8.27s 0:08.89 95.9%
# time ./san2server.sh
0.31u 7.55s 0:26.77 29.3%
# time ./san2san.sh
0.31u 8.15s 0:08.96 94.4%
# time ./server2server.sh
0.32u 5.83s 0:06.19 99.3%
________________________________
From: Bob [mailto:wick@airmail.net]
Sent: Friday, March 24, 2006 5:40 PM
To: Pandey, Abhimanyu
Subject: Re: disk speed issues
The CX300 has write cache. The internal disks do not. What you are
seing is expected. Nothing is wrong. The CX300 writes faster than the
internal disks.
---------- Original Message -----------
From: "Pandey, Abhimanyu" <apandey@worcester.edu>
To: <sunmanagers@sunmanagers.org>
Sent: Fri, 24 Mar 2006 15:44:00 -0500
Subject: disk speed issues
> hello All,
>
> I am continuing to build by sunfire box with a cx300 san array.
>
> unfortunately everything is fine except for very different data
transfer
> times
>
> when I move a file (big *.Z file) from internal disk to the array it
> completes in about 9 seconds.
>
> when I move the same file back from array to internal disk it takes
> about 27 seconds.
>
> # time ./server2san.sh
> 0.29u 8.18s 0:09.42 89.9%
> # time ./san2server.sh
> 0.30u 7.54s 0:28.08 27.9%
> #
>
> any ideas would be very much appreciated.
>
> thanks,
>
> abhimanyu.
>
> Abhimanyu Pandey
> Information Technologies
> Worcester State College
> 508-929-8913
>
> guruspeak:"...the journey IS the destination..."
> geekspeak:"...the network IS the computer..."
> _______________________________________________
> sunmanagers mailing list
> sunmanagers@sunmanagers.org
> http://www.sunmanagers.org/mailman/listinfo/sunmanagers
------- End of Original Message -------
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