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Conference ssag::ask_ssag

Title:Ask the Storage Architecture Group
Notice:Check out our web page at http://www-starch.shr.dec.com
Moderator:SSAG::TERZAN
Created:Wed Oct 15 1986
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:6756
Total number of notes:25276

6396.0. "20-25MB/sec out to disk with AlphaStation 600?" by NETRIX::"[email protected]" (Mark Terpening) Thu Feb 13 1997 19:41

I have a customer who needs to get 20-25 Megabytes/sec out to disk.  He would
like to use an AlphaStation 600.  The application would read data from a Texas
Memory Shared Access Memory device and write the data to disk.  The total disk
space required is 16GB.  If this is not achievable using a AS600, I would
appreciate any suggestions for the least expensive solution. 

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T.RTitleUserPersonal
Name		DateLines
6396.1use 8 7200 RPM disks and 2 wide SCSIsCERN::HOBBSCongrats to the Ignoble Peace Prize winner! (http://www.eecs.harvard.edu/ig_nobel)Thu Feb 13 1997 23:5724
Writing to a non-fragmented file, my AS600 can sustain 3.5 to 4.5 MB/sec
to an RZ29B or RZ28D on wide SCSI (P2SE).

You should fit this requirement easily with

	2 wide SCSI  (the external port from the P2SE plus a KZPDA)
	8 RZ28D 7200 RPM 2 GB disks

Place the disks in a stripe set (RAID 0) properly

	bus A disk 0
	bus B disk 0
	bus A disk 1
	bus B disk 1
	...
	bus A disk 3
	bus B disk 3

and make sure that the application uses large (~64K or better) I/Os and
avoids file fragmentation.

-cw

ps: O/S not relevant, all 3 of our systems can do this!
6396.2NETRIX::"[email protected]"Mark TerpeningWed Feb 19 1997 19:316
Thanks for the info.  Where can I find some info on the kzpda?  It is not
mentioned in the SOC.

Thanks,
Mark
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