Re: ADSM mirroring vs. AIX mirroring
1998-01-06 09:17:50
Wow, this sounds suspiciously like the old scare tactics that would
cause folks to buy a ton of hardware!! To double your capacity just so
that you "have a prayer that a bad write during ADSM crashed" only got
propogated to 1 of the mirrored sets, is unjustified. Since ADSM is
stable program-wise, if that improbable corruption occurred, how about
using the recovery procedures? MassMutual hasn't had ANY corruption of
DB's (crossed fingers) in the last 2 years. Think of how much mainframe
DASD we've saved. If this philosiphy was common practise,, would we
have to mirror DB2 and other DB's?? Yikes, there goes the hardware
budget!!!!!!!
> -----Original Message-----
> From: Pittson, Timothy ,HiServ/NA [SMTP:tpittson AT HIMAIL.HCC DOT COM]
> Sent: Monday, January 05, 1998 11:45 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: ADSM mirroring vs. AIX mirroring
>
> Joe,
> If it comes down to using ADSM or AIX to mirror the database,
> I'd use
> ADSM mirroring. I think the big advantage to using ADSM mirroring is
> in
> the event of the system crashing during a DB write and causing DB
> corruption. With AIX mirroring, I think you're SOL but with ADSM
> mirroring, if the write didn't complete to both copies of the DB, you
> stand a chance of one copy of the database not being corrupted.
> Regarding RAID, I had posted questions to the ADSM-L listserver a
> couple
> of years ago about this and received some very helpful information -
> somebody had even done some benchmarking (7137 array vs. SCSI vs. SSA
> or
> something like that - this was a long time ago - at the time, the 7137
> outperformed the other options ). We decided on using a dedicated
> 7137-514 disk array configured for RAID-5 w/hot spare for our ADSM DB
> (16 GB) and have been very happy with the performance. There had also
> been some posts about using mirroring/striping with SSA disks but I
> don't know what the results of that were. I keep the recovery logs on
> separate dedicated SSA disks and use ADSM mirroring to mirror them.
>
> Tim Pittson
>
>
> >-----Original Message-----
> >From: Joe Morris [SMTP:morris AT UNC DOT EDU]
> >Sent: Monday, January 05, 1998 10:49 AM
> >To: ADSM-L AT VM.MARIST DOT EDU
> >Subject: ADSM mirroring vs. AIX mirroring
> >
> >I've been browsing through the ADSM archives at Marist and could not
> find
> >what I was looking for. Setting up a new server that has ample space
> to
> >replace our old ADSM server.
> >
> >What are the pros and cons of using ADSM and AIX to mirror the
> database
> >and log volumes. Mainly focusing on differences between using AIX
> >mirroring and the built-in mirroring in ADSM.
> >
> >I had considered a RAID configuration, but it seems like that is not
> such
> >a hot solution for the database for performance reasons. Am I wrong?
> >
> >_______________________________________________________________
> >Joe Morris - morris AT unc DOT edu - http://sunsite.unc.edu/morris
> >Academic Technology and Networks, Development and Eval Services
> >University of North Carolina at Chapel Hill PGP by request
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- ADSM mirroring vs. AIX mirroring, Joe Morris
- Re: ADSM mirroring vs. AIX mirroring, Andrew Raibeck
- Re: ADSM mirroring vs. AIX mirroring, Pittson, Timothy ,HiServ/NA
- Re: ADSM mirroring vs. AIX mirroring, Sheelagh Treweek
- Re: ADSM mirroring vs. AIX mirroring,
Sanders, David <=
- Re: ADSM mirroring vs. AIX mirroring, Richard Sims
- Re[2]: ADSM mirroring vs. AIX mirroring, Bill Colwell
- Re: ADSM mirroring vs. AIX mirroring, Pittson, Timothy ,HiServ/NA
- Re: ADSM mirroring vs. AIX mirroring, Sanders, David
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