We are a 2-tier site, using Vision HA to mirror our production system. Production is 830 8-way, backup system is 740 12-way. Both systems use RAID-5 with ASP2 mirrored for journal receivers. We are a 24x7 company, so system availability is important to us. The HA setup delivers 2 ways.
Firstly, should the production system fail, we have the ability to role-swap to the backup system. We have tested this (we still perform the swap manually) and can have SAP up and running on the backup system inside 15 minutes.
Secondly, we can perform full backups to tape each day (night?) from the backup server. We suspend SAP database activity (DSCR3SYS), change journal receivers to establish a sync point, then using a feature of Vision, submit the backup to tape (BRMS) from the production system to run on the backup system, before resuming SAP activity (RCNR3SYS). The entire process takes about 5 minutes, during which time R/3 users see an hourglass if they try and do anything.
The Vision product uses journal entries to inform the backup system what to do, so the "remote command" facility allows us to submit the backup to tape using BRMS from the source system immediately following the change journal. While we are yet to have to recover from a failure using one of these tapes, we have created new R/3 instances from them, so can attest to their reliability.
Andrew Tilbrook Technical Team Leader - Project Enterprise Dairy Farmers 5a Birnie Avenue Lidcombe NSW 2141 AUSTRALIA +61 2 9475 1597 +61 407 794 688
-----Original Message----- From: Robert Ingrum [mailto:basisadmZs...] Sent: Wednesday, 13 December 2000 10:32 To: 'sap400Zm...' Subject: Survey: What is everyone doing for availability?
Please don't complain that this is the same query as the H/A postings that went on recently!!! It is different!!!
Our management wants us to prepare a number of different availability/recovery scenarios and the relative expense of each. We are not seeking just 7/24 solutions, but we are analyzing the whole continuum of availability from just RAID5 DB with RAID1 journaling, on up to full blown 7/24 availability. Our management wants us to prepare a number of different availability/recovery scenarios and the relative expense of each.
So please drop a line and let us know what you are doing in this regard and what your opinion of it is.
By the way, a belated thank you to everyone who responded to our inquiry regarding the different options for our OSS connection. We are going with frame relay because we require the uptime and bandwith. We were also concerned about SAP getting on the system at odd hours. Thanks!!!
Robert Ingrum Basis Consultant Louis Dreyfus Corp. 203-761-8230
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