Eric Anderson wrote:
I'm using fiber channel SATA, and I get 2x write as I do read, which
doesn't make sense to me. What kind of write speeds do you get? My
tiny brain tells me that reads should be faster than writes with a RAID5.
I'm seeing similar sequential performance on RELENG_5_3 and REL
Peter Losher wrote:
Steven Hartland wrote:
5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
dd if=/dev/da0 of=/dev/null bs=64k count=1
1+0 records in
1+0 records out
65536 bytes transferred in 13.348032 secs (49097875 bytes/sec)
Have you tried the driver supplied by Highpoint as a pre
Steven Hartland wrote:
> 5.4-STABLE Highpoint 1820a RAID 5 ( 5 disk )
> dd if=/dev/da0 of=/dev/null bs=64k count=1
> 1+0 records in
> 1+0 records out
> 65536 bytes transferred in 13.348032 secs (49097875 bytes/sec)
Have you tried the driver supplied by Highpoint as a pre-compiled
Scott I've sent this to you as from reading around you did the
original driver conversion and as such may have an idea
on the areas I could look at hope you dont mind.
Ok some real strange going on write performance is ~ 140MB/s:
gstat:
dT: 0.505 flag_I 50us sizeof 240 i -1
L(q) ops/sr/
- Original Message -
From: "Arne Wörner" <[EMAIL PROTECTED]>
Did you try RedHat Linux or FreeBSD R4?
Haven't tried R4 or Linux yet. Just finished restoring
700GB onto the machine and would rather not have
to do that again :)
Steve
Thi
Arne Wörner wrote:
--- Steven Hartland <[EMAIL PROTECTED]> wrote:
Only on write this is a read test.
Oh. Ok! :-)
But there is a striping-like effect (especially when u use n=8
discs in one RAID-5 and when u do sequential read), so that the
performance could be easily (n-1)*40MB/sec (which would be
--- Steven Hartland <[EMAIL PROTECTED]> wrote:
> Only on write this is a read test.
>
Oh. Ok! :-)
But there is a striping-like effect (especially when u use n=8
discs in one RAID-5 and when u do sequential read), so that the
performance could be easily (n-1)*40MB/sec (which would be in your
case 3
--- Steven Hartland <[EMAIL PROTECTED]> wrote:
> From: "Eric Anderson" <[EMAIL PROTECTED]>
> >> Where do I start looking?
> > First, understand that RAID 5 is dependant on fast hardware to
> > performa
> > the XOR operations. A single disk without any RAID can easily
> > outperform a RAID array i
- Original Message -
From: "Eric Anderson" <[EMAIL PROTECTED]>
Correct - I misread the dd line. When you are doing the dd, what is
your system busy doing? (top/ps info)
The machine is idle only me doing the test via an ssh session.
What do you suspect?
I really dont know what it could
Only on write this is a read test.
- Original Message -
From: "Arne Wörner" <[EMAIL PROTECTED]>
Furthermore RAID-5 needs to read the parity block, before it can
update that block, so that there are 2 disc transactions more,
which could explain the better performance of a single disk, too?
--- Eric Anderson <[EMAIL PROTECTED]> wrote:
> First, understand that RAID 5 is dependant on fast hardware to
> performa
> the XOR operations. A single disk without any RAID can easily
> outperform a RAID array if the RAID array is on a 'slow'
> controller.
> The Highpoint controllers are not e
Steven Hartland wrote:
- Original Message - From: "Eric Anderson" <[EMAIL PROTECTED]>
Where do I start looking?
First, understand that RAID 5 is dependant on fast hardware to
performa the XOR operations. A single disk without any RAID can
easily outperform a RAID array if the RAID array
- Original Message -
From: "Eric Anderson" <[EMAIL PROTECTED]>
Where do I start looking?
First, understand that RAID 5 is dependant on fast hardware to performa
the XOR operations. A single disk without any RAID can easily
outperform a RAID array if the RAID array is on a 'slow' contr
Steven Hartland wrote:
I've just finished putting together a new server box spec:
Dual AMD 244, 2GB ram, 5 * Seagate SATA 400GB on a
Highpoint 1820a RAID 5 array.
The machine is currently running 5.4-STABLE ( from the
weekend ) After install I did some basic tests and the
disk is return very poor p
Sorry wanted to send to performance not current :)
Steve
- Original Message -
I've just finished putting together a new server box spec:
Dual AMD 244, 2GB ram, 5 * Seagate SATA 400GB on a
Highpoint 1820a RAID 5 array.
The machine is currently running 5.4-STABLE ( from the
weekend ) Afte
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