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RE: [Xen-users] RAID10 Array

  • To: "Adi Kriegisch" <kriegisch@xxxxxxxx>, <Xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
  • Date: Thu, 17 Jun 2010 11:05:12 +0100
  • Cc:
  • Delivery-date: Thu, 17 Jun 2010 03:11:10 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcsOBFP9f0KnbHlVQfuWK1wyEVwJEwAAD+W3
  • Thread-topic: [Xen-users] RAID10 Array

Hi Adi,
You've got me very interested in ATA-over-ethernet. Reading around online, it seems very simple! I have a couple of questions if you don't mind:
1) Can I export LVM volumes as block devices using ATAoE? Then, the "clients" (Xen nodes) can do their own LVM stuff with the exported "device"..
2) How would I use 802.3ad "link agregation" with ATAoE?

From: Adi Kriegisch [mailto:kriegisch@xxxxxxxx]
Sent: Thu 17/06/2010 11:02
To: Jonathan Tripathy
Cc: Robert Dunkley; Xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] RAID10 Array


> Can you suggest a way I could benchmark all these things? I've never
> benchmarked Hard Drives before..
As mentioned in my previous mail -- use (for example) fio to do benchmarks. 
Before you start with benchmarking I suggest to read the following slides:
There are many very clever hints in this document. Getting benchmarking
right is very hard and giving general statements about performance is
(close to) impossible... ;-)
Just one more thing: You cannot compare local benchmarks to benchmarks of
iSCSI/AoE targets. Devices connected to your local bus have a way lower
latency! This results in lower throughput mainly. RAID0 on local disks
gives way higher throughput in terms of MBps than network storage. Therefor
"IOPS" were invented... ;-)

Feel free to ask, if you need more specific hints on how to conduct
benchmarks... I have recently done some work in this area.

-- Adi

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