Does anyone have any insights here? How do I interpret the seemingly competing
system iowait numbers... is my system both CPU and PCI bus bound?
- Original Message
From: nefilim
To: linux-raid@vger.kernel.org
Sent: Thursday, October 18, 2007 4:45:20 PM
Subject: slow raid5 performance
- Original Message
From: Peter Grandi [EMAIL PROTECTED]
Thank you for your insightful response Peter (Yahoo spam filter hid it from me
until now).
Most 500GB drives can do 60-80MB/s on the outer tracks
(30-40MB/s on the inner ones), and 3 together can easily swamp
the PCI
Thanks Justin, good to hear about some real world experience.
- Original Message
From: Justin Piszcz [EMAIL PROTECTED]
To: Peter [EMAIL PROTECTED]
Cc: linux-raid@vger.kernel.org
Sent: Monday, October 22, 2007 9:58:16 AM
Subject: Re: slow raid5 performance
With SW RAID 5 on the PCI bus
Peter wrote:
Thanks Justin, good to hear about some real world experience.
Hi Peter,
I recently built a 3 drive RAID5 using the onboard SATA controllers on
an MCP55 based board and get around 115MB/s write and 141MB/s read.
A fourth drive was added some time later and after growing the
On Tue, 23 Oct 2007, Richard Scobie wrote:
Peter wrote:
Thanks Justin, good to hear about some real world experience.
Hi Peter,
I recently built a 3 drive RAID5 using the onboard SATA controllers on an
MCP55 based board and get around 115MB/s write and 141MB/s read.
A fourth drive was
On Mon, 22 Oct 2007 15:33:09 -0400 (EDT), Justin Piszcz
[EMAIL PROTECTED] said:
[ ... speed difference between PCI and PCIe RAID HAs ... ]
I recently built a 3 drive RAID5 using the onboard SATA
controllers on an MCP55 based board and get around 115MB/s
write and 141MB/s read. A fourth
On Thu, 18 Oct 2007 16:45:20 -0700 (PDT), nefilim
[EMAIL PROTECTED] said:
[ ... ]
3 x 500GB WD RE2 hard drives
AMD Athlon XP 2400 (2.0Ghz), 1GB RAM
[ ... ]
avg-cpu: %user %nice %system %iowait %steal %idle
1.010.00 55.56 40.400.003.03
[ ... ]
which is
real
world?) quite yet... I see a lot of time being spent in the kernel.. and a
significant iowait time. The CPU is pretty old but where exactly is the
bottleneck?
Any thoughts, insights or recommendations welcome!
Cheers
Peter
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