The cause of the low write performance is the disabled write cache. Enabling the write cache is unsafe on SATA drives (with or without NCQ), since they do not make any guarantees that nearby data is not lost if power fails during a disk write. It never happened to me, but there is a reason that SAS drives have less capacity, much lower BER (one to two magnitudes) and are more expensive than SATA drives.
interface have nothing to do. Both allows you to force writes now and then.
The solution to the performance problem is simple: Turn on the write cache. If the data is valuable, then SAS is the solution to both the
If data is valuable, regular and well done backup practice is the only solution.
would pay one developer hour. Asking Nvidia to release the confidential documentation for their chip-set might help, but I doubt that there is much interest to add support for NCQ to an obsolete chip-set, today, unless you pay a developer (and even then ...).
Even without this, i've never seen properly working NVidia hardware. ANY _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
