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.
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