Very poor performance from Dell/LSI Logic SAS 3000 series SATA/SAS RAID controller FreeBSD 6.3

[Xin LI]

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Andrew Snow wrote:
| Warren Guy wrote:
|> Thanks a lot for that. This seems to have alleviated the problem, I'm
|> seeing
|> decent performance now in my limited benchmark. It seems quite odd to
|> me that
|> the write cache is not enabled by default, but oh well.
|
| Technically with UFS, it can lead to filesystem or database corruption -
| when the power goes off suddenly, the OS+controller thinks the data has
| been written, but the drive has it in cache that is not battery-backed.

I believe that data corruption can happen on every place if writing
cache is lost, it's not an UFS-specific feature :)

Cheers,
- --
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|>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Xin LI <delphij at delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!
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