as additional experiences or feedback
> with Hitachi or EMC they
> > would like to share or comments (agree/disagree)
> with my thoughts, I'd love
> > to hear them. I'm open for learning!
> >
> > Thanks,
> >
> > John Dailey
> > Oracle DBA
&g
Battery backup on the controller should help in this case.
If there is none, "write back" mode should be used (instead of "write
through"), loosing advantages of on-board caching (still helps with the
"reads").
Igor Neyman, OCP DBA
[EMAIL PROTECTED]
- Original Message -
To: "Multiple r
Marie, there is a thread going on this Oracle list about disk subsystem speed, I am
going to forward a couple of the responses to you. I think that it is reiterating
that we need to have raid 0+1 in our PROD environment.
>>> [EMAIL PROTECTED] 04/10/02 01:06PM >>>
James Howerton wrote:
>
> J
; with my thoughts, I'd love
> to hear them. I'm open for learning!
>
> Thanks,
>
> John Dailey
> Oracle DBA
> ING Americas - Application Services
> Atlanta, GA
>
>
>
>
>
>
> "Don
>
>
I'm open for learning!
Thanks,
John Dailey
Oracle DBA
ING Americas - Application Services
Atlanta, GA
"Don
Granaman"To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
> "Don
> Granaman" To: Multiple recipients of list
>ORACLE-L <[EMAIL PROTECTED]>
> .net>Subject: Re: disk subsystem performance
>qu
Granaman"To: Multiple recipients of list ORACLE-L
<[EMAIL PROTECTED]>
Subject: Re: disk subsystem performance
question
Much of the supposed 'speed' may come from onboard
caching on the controller. There is the minor risk
that a crash could come after Oracle commits the data
and before it is actually written to disk.
--- [EMAIL PROTECTED] wrote:
> Hi all,
>
> We are running both a Hitachi 7700E and a 9960 disk
>
John,
We use 7700E. Most all EMC is going out and being replaced by HDS RAID-5.
(What it costs is more important that what it does). Everything we have is
on RAID-5 these days.
HDS Techies and our Capacity Planners (who do the disk assignments to
Servers) told me the following: The 18GB drives a
James Howerton wrote:
>
> John,
>
> We have the Hitachi 5800 series with RAID 5. The sales guys also said
> their system is
> "s fast we need not worry about such minor details". Don't believe
> them!!! Write speed is "SLOW". After we added bare drives for redo log
> files, archive logs, &
Short answer - NO! Nobody's disk subsystem is so fast that no intelligence
is required in the layout. This is common vendor blather and one of the
most popular myths. I have been hearing it for at least six years - and it
still isn't true. Layout still makes a huge difference. RAID levels sti
John,
We have the Hitachi 5800 series with RAID 5. The sales guys also said
their system is
"s fast we need not worry about such minor details". Don't believe
them!!! Write speed is "SLOW". After we added bare drives for redo log
files, archive logs, & conrtol files it made a dramatic differe
John - I haven't experienced the Hitachi disks. To me the key question is
how much battery-backed cache the subsystem has. I believe there tends to be
a gap in knowledge between DBAs and the disk people. The two don't always
understand each other or speak the same language. The Oracle books tend t
Hi all,
We are running both a Hitachi 7700E and a 9960 disk subsystem here and we
are getting ready to move our production DBs from the old(7700E) to the
new(9960) Hitachi. We have had trouble in the past on the 7700E due to
disk contention and layout, i.e. we weren't striped across the arra
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