From: Harvey, Bruce T. (BTHarvey@LMUS.LEGGMASON.COM)
Date: Tue Nov 11 2003 - 14:08:11 EST
Folks,
We have four physical 9.1Gb SSA drives on one (IBM SSA 160 SerialRAID)
Adapter with Fast-Write enabled (three are arranged into a raid-5 array and
one is a system disk) and a fifth physical drive on the same controller and
system has Fast-Write DISabled. Will this slow down the entire set of disk
to where it's as if the fast-write is disabled for all of them?
That appears to be what we are seeing, but no one currently knows if the
time prior to when we started seeing slowness all the disks had it enabled
or the config's exactly like we see it now --- "our bad."
Do I understand the SSA looping and adapter characteristics properly in that
if it's not on for everyone, it's not on, or at least there's severe
degradation from what it could be?
Many thanks in advance!
Bruce T. Harvey
Legg Mason Wood Walker, Inc.
Corporate Technology - UNIX Admin.
Red Run 2nd Floor - Owings Mills, MD
(410) 580-7383 - BTHarvey@LeggMason.com
-------------------------------------------------------
IMPORTANT: The security of electronic mail sent through the Internet
is not guaranteed. Legg Mason therefore recommends that you do not
send confidential information to us via electronic mail, including social
security numbers, account numbers, and personal identification numbers.
Delivery, and timely delivery, of electronic mail is also not
guaranteed. Legg Mason therefore recommends that you do not send time-sensitive
or action-oriented messages to us via electronic mail, including
authorization to "buy" or "sell" a security or instructions to conduct any
other financial transaction. Such requests, orders or instructions will
not be processed until Legg Mason can confirm your instructions or
obtain appropriate written documentation where necessary.
This archive was generated by hypermail 2.1.7 : Wed Apr 09 2008 - 22:17:20 EDT