Adrian,
UniVerse Transaction Logging will solve the problem experienced with the
proposed HW / SW solution. It is imperative that the integrity of the file
structure be maintained. And yes, these products are not aware of the
internal file structure of UniVerse.
Being very nit picky, there is one point when a file can be corrupted
(broken)
+ extends for overflow groups on a static file or
+ dynamic files growing or compressing
At a high level, there are three writes that occur for these events:
+ forward pointer gets added to the current disk record
+ the backward pointer gets added to the added disk record
+ the header of the file is updated
Should any one of these three write not make it to disk - you have a broken
file. The most common reason is that disk writes can be held in the write
buffer cache.
UV Transaction Logging corrects this problem. After system failure, when
WarmStart occurs , the open transaction log is applied against the UV data
files ensuring that the internal file structure is intact.
Thanks,
Steve
Stephen M. O'Neal, CDP IBM Certified
SWG Services Sales Specialist / Channels U2
P.S. I will be speaking on the interaction of HW, SW and OS at
|-+--
| | Adrian Matthews |
| | [EMAIL PROTECTED]|
| | x.co.uk |
| | Sent by: |
| | [EMAIL PROTECTED]|
| | er.u2ug.org|
| | |
| | |
| | 09/02/2004 06:43 AM|
| | Please respond to |
| | u2-users |
|-+--
--
-|
|
|
| To: [EMAIL PROTECTED]
|
| cc:
|
| Subject: RE: [U2] [UV] SRDF from EMC
|
--
-|
Depends on how you're using it. We used to have a similar product from
Veritas that wasn't any use for U2 as it wasn't aware of the U2 file
structures so if the replication broke mid-update the file on the other
end was always corrupted.
IBM subsequently advised me very strongly not to do it.
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Stephen O'Neal
Sent: 02 September 2004 13:13
To: [EMAIL PROTECTED]
Subject: [U2] [UV] SRDF from EMC
Greetings All!
http://www.emc.com/products/networking/srdf.jsp
If your installation is running this piece of software, would you please
contact me (either thru the list or off line)?
We have a client that is looking for references. On paper, looks like a
great product that should be used with UniVerse Transaction Logging for
a
complete solution.
Have a Great Long Weekend!
Steve
Stephen M. O'Neal, CDP IBM Certified
SWG Services Sales Specialist / Channels U2
Specialist in High Availability Solutions for the U2 Product Line -
(HW,
SW O/S)
---
u2-users mailing list
[EMAIL PROTECTED]
To unsubscribe please visit http://listserver.u2ug.org/
The information contained in this email is strictly confidential and for
the use of the addressee only, unless otherwise indicated. If you are not
the intended recipient, please do not read, copy, use or disclose to others
this message or any attachment. Please also notify the sender by replying
to this email or by telephone +44 (0)20 7896 0011 and then delete the email
and any copies of it. Opinions, conclusions (etc.) that do not relate to
the official business of this company shall be understood as neither given
nor endorsed by it. IG Markets Limited and IG Index Plc are authorised and
regulated by the Financial Services Authority and, in Australia, by the
Australian Securities and Investments Commission.
---
u2-users mailing list
[EMAIL PROTECTED]
To unsubscribe please visit http://listserver.u2ug.org/
[demime 1.01d removed an attachment of type image/gif which had a name of graycol.gif]
[demime 1.01d removed an attachment of type image/gif which had a name of ecblank.gif]
[demime 1.01d removed an attachment of type image/gif which had a name of pic08989.gif]
---
u2-users mailing list
[EMAIL PROTECTED]
To unsubscribe please visit http://listserver.u2ug.org/
