We are about to go live with a system with two Power servers both running
IBM FlashSystes V5030 SANs fully populated with SSDs.

We are utilising Metro Mirror to keep our production and DR SANs in sync so
if production dies we can make our remote SAN LUN as writeable and IPL the
DR box.

Somebody mentioned to me be wary of journal caching turned on with the
command JRNCACHE(*YES) function in CHGJRN as you could have uncommitted
journals around when the system crashed and thus lose data. Another piece
of advice said you might only lose a few milliseconds of data in a worst
case sceario.

Given we don't have a high transaction volume system and the SANs are very
fast, it seems we could turn that feature off and not lose any performance
and also not lose any data. Does that seem like a reasonable option to
explore? Also it appears that journal caching is a paid option and since
this application is quite old and the configuration is not that well
documented, is there an easy way to tell if that option has been purchased
and is turned on?


As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2022 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.