I would go for the one that promises to have a RAID-5 implementation
that doesn't suffer from the usual RAID-5 problems. Heh-heh.
Mogens
Jay Hostetter wrote:
One of our hardware guys is seeking an opinion on SANs. He is comparing the Hitachi Thunder 9500 to the HP EVA 5000. Does anybody have
(and at the same time, the secondary box takes control of the
external disk array). I think the clustering term in point (4) is
referring to this setup.
Thanks for any
suggestions.
Sam.
Sent:
November 18,
2003 5:08
PMSubject: RE: SAN configuration for
Banner
today or not.
But I would also be interested in more details on this.
Thanks!
Sam.
-Original Message-
From: Niall Litchfield
[mailto:[EMAIL PROTECTED]
Sent: November 20, 2003 7:44 AM
To: Multiple recipients of list
ORACLE-L
Subject: RE: SAN configuration for
Banner
Hi
Check out www.baarf.com regarding RAID levels.
Check especially the Sane SAN paper by James Morle as to do's and dont's.
EVA stuff is expensive, and some of our customers have had to spend much
time and money on spare parts and consultants. Others have been happy
with it.
Mogens
Jeroen van
John,
re your suggestion to ask the vendors about the
Veritas File System,
both Sun and Hitachi said that the Veritas VxFS filesystem
is not portable across servers. Thus a Sun server
cannot read an VxFS file system on an HP server.
We cannot, therefore, backup a SAN shadow-image
of a Veritas
John,
I forwarded your suggestion, together, with more information on the Veritas
Foundation Suite
to the team negotiating the hardware solution with the vendors [my involvement
came in as I was allowed to us about how database backups in a SAN
were to be done].
Hemant
At 09:29 AM 07-02-03
Hemant,
Could you check what happens if all the filesystems that were 'shadow
copied' were VxFS filesystems? I would assume that Veritas maintains the
same formats across *nix versions Btw, I haven't implemented
Heterogenous implementations on a SAN, but am just suggesting an
alternate... Let
The ADABAS/Natural/Predict list server that I know about:
http://www.uark.edu/sag-l/faq.html
You can also contact me directly and I will help if I can.
Yechiel Adar
Mehish
- Original Message -
To: Multiple recipients of list ORACLE-L [EMAIL PROTECTED]
Sent: Friday, August 16, 2002 6:03
So if I get a problem with my Mainframe Adabas databases Natural or Predict
environments where do I post?
To come back to the SAN side of things. We have a number. Basically the
expensive one works extremely well with Oracle databases. Split out the
database, the log files and the redo log
I want to stress again that I am not I/O expert.
As to your question:
Assume a table with 54 block divided in two extents of 27 blocks.
(I deliberately took a worst case)
With direct read you get 54 physical I/O to the disks.
With My algorithm you get 10 physical I/O to the disk
with nine
Babu,
Is it possible that you are confusing the term SAN with the term NAS?
As I read through your email, I couldn't help thinking that you discussing
network-attached storage rather than storage-area networks. If so, some
of my comments below might change slightly, but not much...
---
Most
Tim, Jared and Kirti
Jared, Kirti : Thanks a lot for your input. and yes, I read the Sane SAN
paper.
Tim : Many thanks to you for pointing out some of the big misassumptions
I had made. I have corrected most of the stuff you had mentioned except
for these
.* I'm less clear on whether
You wrote:
Will the smarter algorithm look inside the contents of a file before
reading it? If it does not, then how will it be able to intelligently
read ahead what data Oracle wants from inside its datafile? If it does,
how
does it decipher the Oracle's way of storage?
How about using a
Nice to see someone who knows what ADABAS is.
Ron S.
-Original Message-
Sent: Tuesday, August 13, 2002 1:50 PM
To: Multiple recipients of list ORACLE-L
You wrote:
Will the smarter algorithm look inside the contents of a file before
reading it? If it does not, then how will it be
But inside a Oracle datafile a table may not lie in contigious blocks. so I
you are doing a full table scan 2 extents can lie next to each other than
then the remaining 2 can sit at the end of the datafile. Will the
non-Oracle process be able to decipher this and do a read ahead of those
two
Babu,
Nice comprehensive list of things to consider with a SAN,
Just a couple of thoughts.
® Oracle requests DBWR-1 for IDX1 and waits. DBWR-1 makes a Unix IO
call and waits for Unix to return data. Unix talks to SAN and SAN starts
reading from the disk. Assume that it takes 3 seconds
Babu,
If you have not already done so, please also review a paper by James Morle
: Sane SAN http://www.scaleabilities.com/whitepapers.shtml
- Kirti
-Original Message-
Sent: Monday, August 12, 2002 6:45 PM
To: Multiple recipients of list ORACLE-L
Babu,
Nice comprehensive list of
James Morle wrote a paper about this called Sane SAN. You can download it from
www.oraperf.com.
Anjo.
Mandar A. Ghosalkar wrote:
Hello Guys,
any guys here who have SAN. We are inviting a SAN vendor for possible solutions for
our enterprise.
i am unaware about how SAN would affect me as
I like SAN's for alot of reasons and if you are using
them in a traditional non-replicated environment, they
work well. Just don't buy into the sales hype that you
don't need to do phsycial database design because we
have should big caches etc... Those big caches are
great for improving write
I personally love James Morle's Sane SAN paper available on for instance
www.OraPerf.com. James is cool and knows what he's talking about. I used
to say with pride that James is the guy who wrote the book which is
placed in my bathroom. Turns out that while we've been away for the
Database
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