RE: Recovery Time estimate for abnormal system end due to DASD usage

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Elvis Budimlic
Sent: Wednesday, December 05, 2007 12:23 PM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Recovery Time estimate for abnormal system end
due to DASD usage

<vendor response>
For a cheap insurance policy against unexpected DASD spikes check out
disk/HUNTER:
http://www.centerfieldtechnology.com/tools/diskhunter.asp
</vendor response>

Already contacted you guys :)

As for estimating recovery time, it is pretty much impossible
to do without
knowing much more about your system's config (journaling, SMAPP, ...).

Most our files are journaled and SMAPP is set at the default of 70min. The DSPRCYAP screen shows a
46min estimate for recovery. How accurate is that? Recovery of the access paths is a big part of IPL
right, so if we had crashed, would the IPL been done in an hour or so (assuming the 46min est was
still in effect)? Or maybe two hours is the activity at the time had the SMAPP estimate up to 70min.

I found a message in the archives that mentions the possibility that an IPL doesn't clean off enough
temp space for the IPL to complete which means the only recovery is a full system restore. Is that
still a possible scenario?

Significant part can be played by access path recovery time for large
indexes that are automatically journaled by the system
(SMAPP). Once IPL
starts you can use EDTRCYAP to check the estimated times.
Going forward you
can use that same command to be more or less aggressive about future
recovery times.

You may also check into changing journal recovery ratio to be more
aggressive on recovery time. Search InfoCenter on QJOCHRVCR program.

As I mentioned in another post, we didn't actually crash, but came close. Now I'm looking for ammo to
use in the battle to get something like your Diskhunter tool.

Note: It's QJOCHRVC not QJOCHRVCR

Thanks!
Charles


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