Re: MIRRORING DILEMMA
1999-11-03 00:36:43
Just to throw out more bait....
Why not do *ahem* hardware mirroring from the adapter via raid 1 as opposed
to Raid 5? Raid 5 isn't always the best choice, especially if you're
dealing with only a couple of drives.
It seems to me the topic in the past has always been ADSM Mirroring vs. AIX
Mirroring, not ADSM Mirroring vs. hardware mirroring. IMHO, If I had to
choose between ADSM Mirroring and hardware mirroring, I'd take the hardware
mirroring - you're reducing processor and planar overhead. If I had to
choose between ADSM mirroring and AIX mirroring, I'd take ADSM. I've
watched ADSM recover from a dead, mirrored quite gracefully, and I've
watched AIX die a horrible death from a dead, mirrored disk quite uglily (is
that a word?). I know others may have different observations, bet hey, what
I've seen with my own eyes probably clouds my judgement.... :)
BTW, Terminology is a function of the people who interpret it. Most of the
IT industry accepts the term *hardware* mirroring to be defined as mirroring
done on the adapter level. Sure, it's run by software sitting on the
adapter, but hey, as you said, it's a heck of a lot closer to the hardware
than ADSM, and that's a heck of a lot closer to hardware than most people
would like to get, so using the term *hardware* works in my books.
Now it's time for me to duck....<d'oh!>
later,
Paul
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Paul Fielding <=
- Re: MIRRORING DILEMMA, William Dias
- Re: MIRRORING DILEMMA, Remeta, Mark
- Re: MIRRORING DILEMMA, William Dias
- Re: MIRRORING DILEMMA, Richard L. Rhodes
- MIRRORING DILEMMA, Valles , Raul [mailto:rrv3
- Re: MIRRORING DILEMMA, Richard Sims [mailto:rbs
- Re: MIRRORING DILEMMA, William Dias [mailto:wdias
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