Re: 3ware 9550SX problems - mke2fs incredibly slow writing lastthird of inode tables

[Alex Bligh - linux-kernel]

--On 01 November 2005 18:13 +0100 Florian Weimer <fw@xxxxxxxxxxxxx> wrote:

> > > In my experience, the 3ware SATA controllers which are not NCQ-capable
> > > have very, very lousy write performance with some drives, unless you
> > > enable the write cache (which is, of course, a bit dangerous without
> > > UPS or battery backup on the controller).
>
> > Not to sound like the a 3ware chearleader, but this card does support
> > NCQ.
>
> Oh.  I didn't know whether this particukar controller supported NCQ or
> not.

It even supports SATA-3, not much good that it does me.

I managed to format it reiserfs in the end. dbench (yes I know it isn't a
great benchmark) gives me a write speed of 7Mb/s compared to 700Mb/s if one
of the disks in the array is attached to the motherboard SATA controller.

7Mb/s is quite stunningly appalling. I realise the release notes warn of
slow writes, but that's just daft! I have a few bits in my setup to check
before I start pointing the finger comprehensively. It may (for instance)
be a large partition problem (suggested on the ext2 list).

I'm taking it that it works at least for some people (did you test write
speed Lawrence?).

--
Alex Bligh
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