vinum, 5.x performance, ... (was: Re: ANNOUNCE: GNOME 2.12.1 has been merged into the ports tree)

[Alexander Leidinger]

Ion-Mihai Tetcu <itetcu at people.tecnik93.com> wrote:

> On Mon, 07 Nov 2005 11:18:00 +0100
> Alexander Leidinger <Alexander at Leidinger.net> wrote:
>
>> > - and performaces is a nightmare on atapi harddisks
>>
>> AFAIR 4.x enables the write cache (bad if there's a power failure in
>> the soft-updates case, since without native command queueing the
>> drivers may reorder writes witout the possibility to notify
>> soft-updates about it),
>
> So on NCQ disks write_caching should be safe from consistency
> point-of-view ?

AFAIK: Enabling the write cache doesn't mean you use NCQ. So just because
your drive is able to do NCQ, you shouldn't enable the write cache. If your
controller, your disk and the OS is able to use NCQ, and you enable the use
of NCQ, then everything is fine... assuming the drive doesn't lie to you.
AFAIR there are or there where some drives which lie(d), but I don't
remember the details.

Bye,
Alexander.

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