Dan Birken wrote:
> - Is the supercap + flash memory considered superior to the BBU in
> practice? Is that type of system well tested?
The main risk is that it's a pretty new approach. The standard BBU
setup has been used for a long time now; this whole flash+supercap thing
has only showed up in the last couple of years. Theoretically it's
better; the #1 weakness of the old battery setup was only surviving an
outage of a few days, and storing to flash doesn't have that issue.
It's just got the usual risks of something new.
> - Is the linux support of the LSI and Adaptec cards comparable?
Seems to be. The latest versions of Adaptec's arcconf utility even
provide about the same quality of command-line tools as LSI's megactl,
after being behind in that area for a while. Only quirk, and I can't
say where this was the manufacturer of the box or not because they
installed the base OS, is that the 5405 setup I saw didn't turn off the
write caches on the individual drives of the system. That's the
standard safe practice and default for the LSI cards.
--
Greg Smith 2ndQuadrant US greg@2ndQuadrant.com Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.us
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