Adaptec 2940UW with Fujitsu MAN3184M

[Justin T. Gibbs]

Baurzhan Ismagulov wrote:
> 
> I've done some tests (hdparm -tT, build the Linux kernel with ccache)
> and have seen that my SATA 7.2k ST3320620AS outperforms U160 10k
> MAN3184M by up to 30%, so I decided not to use it for the rootfs yet.

Make sure you run a fair test.  Most SCSI drives are shipped from the
factory with the write cache set to "write-through".  SATA and ATA
drives almost always operate in "write-back" mode.  Your 29160 BIOS
should have an option to set the caching mode on a per-target basis.

If you're system is backed up by a UPS or your FS can handle being
lied to, write-back is fine.  Otherwise it's really not a safe option.

--
Justin