L.O. (again!),
Thanx to:
alan_at_nabeth.cxo
Andy Walden
Dr. Tom Blinn
Guy Dallaire
Max Pabia
Paul Grant
Peter.Braack
Tom Webster
ESPECIALLY to Peter who suggested turning the writeback cache
on at the HSZ50 controller:
STOAT> show d300
LUN Uses
--------------------------------------------------------------
D300 R4
Switches:
RUN NOWRITE_PROTECT READ_CACHE
NOWRITEBACK_CACHE
MAXIMUM_CACHED_TRANSFER_SIZE = 32
State:
ONLINE to the other controller
PREFERRED_PATH = OTHER_CONTROLLER
Size: 53294505 blocks
STOAT> set d300 writeback_cache
Warning 1000: It is recommended that you read the controller product
documentation to understand the significance of enabling
WRITEBACK_CACHE particularly for RAID Arrays
STOAT> show d300
LUN Uses
--------------------------------------------------------------
D300 R4
Switches:
RUN NOWRITE_PROTECT READ_CACHE
WRITEBACK_CACHE
MAXIMUM_CACHED_TRANSFER_SIZE = 32
State:
ONLINE to the other controller
PREFERRED_PATH = OTHER_CONTROLLER
Size: 53294505 blocks
STOAT> ^D
%108 toad[alpha]/u01/home/franx>
(A bit emabarrassing on my part, but a commendable guess on Peters)
ALSO
from Paul from Scotland (I must get back there 1 day):
> the throughput of two 4.3 gbyte disks is 2 * 140 i/o's per second
> (depending on type of usage).
> the throughput of one 9.1 gbyte disk is 1 * 140 i/o's per second (ditto)
> Therefore there will be loss of performance
> as you have half the io potential of the raidsets.....
AND
the final word from Max:
> The 9G 7200rpm drives are slower than the 4G 7200 rpm
> drives. Dec will be coming out with 10000rpm 9G drives in a few
> months to make up the difference.
> This argument with bigger drives being slower than smaller
> drives have been going on forever. When they first came out with
> 4G 5400rpm drives, the problem then was that the 2G 5400 rpm
> drives were faster than these 4G drives. Then 4G 7200rpm
> drives came out to speed them up.
> Don't buy too many 9G drives yet, and wait for the 10000 rpm
> 9G drives to come out.
Once again, a big "THANKYOU" to everyone who responded; everyone
seemed to have interesting & plausible suggestions on this one.
HAVE A COOL YULE & A GREAT '98
TNX1.0E6, fcG.
--
Frank Gallacher, Sys. ANALyst/Programmer,(aka.frAnXoSAURus reX)
Systems D&I, Operator Assisted Services, Telstra (TELecom auSTRAlia).
___________
(_'-I---I-`_) THE POLITICALLY CORRECT VIRUS:
| 1 2 3 |
| 4 5 6 | Never calls itself a "virus", but instead
| 7 8 9 | refers to itself as an "electronic microorganism."
| * 0 # |
+-------+
phone: (03) 969 34034 Int.: +61 3 969 34034
smtp: franx_at_oas.telstra.com.au, FGallach_at_VENTNOAS.telecom.com.au
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Received on Fri Dec 19 1997 - 02:31:52 NZDT