Dave Gilbert wrote:
>
> On Sat, 1 Apr 2000, W Bauske wrote:
>
> > 3. I tried a hdparm -Tt /dev/hda and it says the
> > SHM file system is not mounted?? I did select
> > SYSV IPC which is where I believe SHM lives.
>
> Ah that little one; some time after 2.3.5x things changed a bit. Make a
> directory /var/shm and add to your /etc/fstab the line:
>
> none /var/shm shm defaults 0 0
>
Great. When I go back to that series I'll do this.
> > One good thing. Promise UATA66 performance is good,
> > on the order of 20MB/sec for my Maxtor 40GB drive
> > it did find. It is unstable however. Locked as I
>
> Hmm that is good going. What does your onboard controller give with the
> same drive?
As in the other thread, the onboard EIDE is the same
as a 164sx it seems and is not a good performer, at
least from what I've seen. A 40GB Maxtor is about 4MB/sec
in DMA mode. Which DMA mode I don't know but I haven't
seen a way to get it going faster yet.
I'm now running 2.2.15pre17 and it's behaving so far.
Had a few patch rejects though but nothing affecting
the HW I use.
Copied 30GB onto a disk on the Promise card and it's
stayed up. Currently reading the data back. It's actually
running very well, around 24MB/sec initially. I see this
drive taper off to around 13MB/sec at the end. We'll see
how it goes.
>
> > doesn't want to write past 8GB which I don't think
> > is the Promise's problem but then again, the Promise
> > reports the drive as an 8GB device so it might be
> > the Promise's fault.
>
> The 8GB problem goes as follows. In yee oldee days the discs were
> specified by Cylinder/Head/Sector - but sense dawned on the face of the
> IDE community and they realised that was silly now. So all large drives
> (should) return a CHS of 16383/16/63 (about 8GB) which is actually an
> indication to the BIOS/OS to ignore the CHS and just use the LBA sector
> count. If you do an hdparm -i on the drives you should see a CHS like
> that but an LBAsects value which if multiplied by 512 gives you the real
> size of the drive.
>
Yes. LBA looks fine. C/H/S is nonsense.
Wes
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