Mark Zelden wrote:
[...]
To your points above... the VSM hardware is just as fully redundant as
DASD (it *is* DASD). The SL8500 library is fully redundant (but even
problems with the back end physical drives don't keep the VSM from
creating new output tapes and reading in tapes from the buffer).
The HSC CDS is a single point of failure... but it is on all that modern
DASD and it also has a secondary backup copy (which should be kept
on a separate controller if available). There is even a 3rd ('standby')
CDS if you are so inclined to run that way.
I'm not talking about physical corruption of CDS. We have mutiple copies
(2 active + 1 standby) to avoid this. I talk about "software reasons".
There are scenarios, which could require to restart all the HSC
instances. It is quite rare, but (again, from my limited experience) it
tend to happen. Indeed, if you have a lot of SMF data (btw: how much SMF
do you have ? Just curious), then it sounds reasonable to dump it to
virtual (!) tape directly. In case of temporary problems you have
another SYS1.MANx, in case of longer outages you can lose some data or
quickly change offload job.
--
Radoslaw Skorupka
Lodz, Poland
--
BRE Bank SA
ul. Senatorska 18
00-950 Warszawa
www.brebank.pl
Sd Rejonowy dla m. st. Warszawy
XII Wydzia Gospodarczy Krajowego Rejestru Sdowego,
nr rejestru przedsibiorców KRS 0000025237
NIP: 526-021-50-88
Wedug stanu na dzie 01.01.2007 r. kapita zakadowy BRE Banku SA (w caoci
opacony) wynosi 118.064.140 z. W zwizku z realizacj warunkowego
podwyszenia kapitau zakadowego, na podstawie uchwa XVI WZ z dnia 21.05.2003
r., kapita zakadowy BRE Banku SA moe ulec podwyszeniu do kwoty 118.760.528
z. Akcje w podwyszonym kapitale zakadowym bd w caoci opacone.
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