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

[Andrew Snow]

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.