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/
