Just a quick update on where I got to regarding this.
Spent quite a few days & nights playing and was finally able to get
the following results (from 140 tests of bonnie++):
Block Write:
Min 93.35 MB/s
Avg 98.57 MB/s
Max 103.22 MB/s
Block Read:
Min
On Fri, Nov 21, 2008 at 12:16:05PM -0800, Heady wrote:
>
> Folks,
>
> I've been struggling with a similar problem for a while now. My write
> speeds are around 110M/s whereas, even following A. Eijkhoudt's advice
> I've only been able to get 34M/s reads.
>
> * The initiator is Open-iSCSI runni
On Sat, Nov 22, 2008 at 10:58 AM, Tracy Reed <[EMAIL PROTECTED]> wrote:
> On Sat, Nov 22, 2008 at 09:44:09AM +0100, Bart Van Assche spake thusly:
>> Maybe not the advice you are looking for, but did you already have a
>> look at the SCST iSCSI target implementation ? It's faster than IET
>> and be
On Sat, Nov 22, 2008 at 09:44:09AM +0100, Bart Van Assche spake thusly:
> Maybe not the advice you are looking for, but did you already have a
> look at the SCST iSCSI target implementation ? It's faster than IET
> and better maintained. There is also a section about how to tune
Does it do MC/S or
On Fri, Nov 21, 2008 at 9:16 PM, Heady <[EMAIL PROTECTED]> wrote:
> * The target is IET running on a Xen dom0 running Gentoo Linux with [ ... ]
Maybe not the advice you are looking for, but did you already have a
look at the SCST iSCSI target implementation ? It's faster than IET
and better maint
hese to given the multiple layers.
Does anyone have any further ideas? comments or suggestions? Anyone
tried this before?
Thanks for your time.
Adrian Head.
------
From: "A. Eijkhoudt" <[EMAIL PROTECTED]>
Date: Sep 13, 1:42 am
Subject: Extremely slow read performance, but
Thank you all very much!
The suggested combinations of network configuration & iSCSI settings
seem to have solved the problem, even though initially the speed
fluctuated very heavily (no idea why ;)). I've run 3 consecutive full
Bonnie++ tests now and tried different combinations, and these are t
More 2c, for everyone. I had unacceptable speeds in general when I first
started using open-iscsi, mainly manifested when reading from my IET
target (both Ubuntu BTW). One issue was as another user mentioned, I was
reading from a fast target (2x3Ghz Xeons) and writing to a slower
(1x2.4Ghz P4)
On Sep 12, 1:29 am, "A. Eijkhoudt" <[EMAIL PROTECTED]> wrote:
> Hello and thanks in advance for reading,
>
> We've been having serious read performance issues with Open-iSCSI.
>
I am having a similar problem, with good write performance and
dreadful read performance, but with bursts of good spe
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A. Eijkhoudt schreef:
> On Sep 12, 3:49 pm, Konrad Rzeszutek <[EMAIL PROTECTED]> wrote:
>> Can you try to copy the file from the iSCSI target to /dev/null?
>
> Yes, no difference. It's still going at a decidedly unimpressive 1.5MB/
> sec.
So what ab
On Sep 12, 3:49 pm, Konrad Rzeszutek <[EMAIL PROTECTED]> wrote:
> Can you try to copy the file from the iSCSI target to /dev/null?
Yes, no difference. It's still going at a decidedly unimpressive 1.5MB/
sec.
> Is the 'local disk array' a software RAID ?
No, it's a hardware RAID5 setup over 12 d
> When we copy a file from the local disk array to the iSCSI target, the
> write performance is amazing: we max out the gigabit link immediately
> (>100MB/sec writes easily). When we copy a file from the iSCSI target
> to the local disk array however, performance is absolutely *dreadful*:
Can you
On Sep 12, 8:08 am, "Bart Van Assche" <[EMAIL PROTECTED]>
wrote:
> Are you aware that not only the readahead settings on the initiator
> side count, but also on the target side ?
I would assume there are, but I don't see options to change that under
Windows Storage Server. Wouldn't the write sp
On Fri, Sep 12, 2008 at 2:29 AM, A. Eijkhoudt <[EMAIL PROTECTED]> wrote:
> - Use different read-ahead settings on the SCSI device 'blockdev --
> setra ...' (4096-65536). This only initially solves the problem: we
> get a short burst of good speed, and then it dies again. It kills the
> random read
Hello and thanks in advance for reading,
We've been having serious read performance issues with Open-iSCSI.
I'll list the specs of our setup first:
The SAN:
- Dual-Core Xeon with 2GB RAM, running Microsoft Windows Storage
Server 2003 R2
- 5TB storage, sliced into two 1.5TB and one 2.0TB partit
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