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  2. MIDRANGE-L
  3. November 2013

RE: Back ups with High Availability Web Server

Sue,

Many good ideas, and many of the problems have been presented.
For libraries, I'm ok with SWA.
For IFS, I'm still looking for a better save solution.
Most of our IFS locked objects are system objects, log files, or temporary files.
None of our apps store any permanent data on the IFS.

Even if we had an HA/DR solution in place (then save the other partition) , most of those solutions use journaling, but, if I'm correct, you can't journal the IFS.
How do HA/DR solutions handle the IFS, I've never looked that far.

For now, I'm planning to omit locked IFS objects on a daily save, get them on a system save. (acceptable, but I don't like it)

Paul



-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Sue Baker
Sent: Wednesday, November 13, 2013 11:29 AM
To: midrange-l@xxxxxxxxxxxx
Subject: RE: Back ups with High Availability Web Server

rob@xxxxxxxxx wrote on Wed, 13 Nov 2013 16:19:56 GMT:

having to power down the system was a bit of a shocker, or is that how
other platforms work with flash copy?


All storage systems have the challenge, you can make a copy of the data that has been written to storage, but when you "flash copy", you only get that data. Any data in main storage of the server which has been updated, the storage has no knowledge of, cannot be copied. This is why it is considered a "crash consistent" copy because when a server crashs, the contents of memory are generally lost.

To be 100% certain all data has been written by the server operating system to disk, you must shut down the server.

IBM i, Windows, Linux, AIX, zOS ... all have the same requirement.

--
Sue
IBM Americas Advanced Technical Skills (ATS) Power Systems Rochester, MN
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