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RE: [Xen-users] RAID10 Array

  • To: "Robert Dunkley" <Robert@xxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: "Jonathan Tripathy" <jonnyt@xxxxxxxxxxx>
  • Date: Thu, 17 Jun 2010 14:01:50 +0100
  • Cc:
  • Delivery-date: Thu, 17 Jun 2010 06:07:49 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcsODKuodrGKuHMCT4KawhXs0TzjOwACT2t6AADtTmAAAOh4Dg==
  • Thread-topic: [Xen-users] RAID10 Array

Hi Rob,
I looked into 10G Ethernet and it may well be an option, however the cost of the switch is 3x the price I had budgeted for. My current issue is how to use multiple interfaces with ATM over Ethernet. Some say just create 4 exports to the same partition/LV, some say use a bond0..
Given that these will be rented VMs, I would imagine most customers will use these for web-sites, mailservers, backup machines (rsync,ftp), game servers. I can't imagine a company doing high I/O tasks would want to place this machine "in the cloud" and run it off a VM. But then again, I could be wrong..

From: Robert Dunkley [mailto:Robert@xxxxxxxxx]
Sent: Thu 17/06/2010 13:56
To: Jonathan Tripathy
Subject: RE: [Xen-users] RAID10 Array

Hi Jonathan,



I don’t think its flawed myself. Maybe an HP 24 port switch with 10gbit uplink would be  worth the extra?

HP 2910AL-24G Switch - £1700

HP 10Gbit Dual SFP+ 10Gbit Module (J9008A) - £1300

Intel SFP+ 10Gbit card - £500


In theory your arrays could produce around 200Mbytes/sec each. Your actual throughput on dual port ad team will produce about 180Mbytes/sec, 4 port might produce  300mbytes+/sec. 10Gbit will produce 600Mytes/sec quite easily and without the CPU overhead of teaming. The 10gbit need becomes greater if you add more disks via external box to the server later.


If 10G is a no go then I would still make sure you get one of the new 1000ET Intel cards.


As for how many VMs you will be able to support well that is hugely dependant on their load/use.







From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jonathan Tripathy
Sent: 17 June 2010 13:18
To: Bart Coninckx; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] RAID10 Array


Hi Bart,

Through this very helpful mailing list, I have over time trimed and changed my plans.

My current train of thought is to have 3 RAID10 arrays with 4 hot spares. The storage server will create 2 LV per RAID Array, and export one LV to each Xen node (So 6 Xen nodes per storage server). The storage server will be connected to the xen nodes via ATA over Ethernet. Each machine will be running 56 DomUs max, however this figure will be closer to around 30 I would say.

Specs for storage server are as follows:

3U Broadberry 836E16-R1200B  chassis (Black) with 1200W high-efficient
(1+1) redundant power supply (Gold Level 93%) 16 x SATA/SAS Hot Swap
drive bays, comprising of the following system validated components:-

1x E5506 Intel Quad-Core Xeon 2.13GHz 4Mb Cache 4.8GT/s 80Watts
8GB 1333MHz DDR3 ECC Reg w/Parity CL9 DIMM Dual Rank
LSI MegaRAID SAS 9260-4i (6Gb/s) RAID Controller
Intel® PRO/1000 PT Quad Server Adapter RJ45 10/100/1000 Quad Port
X8DTL-iF Serverboard with Dual Gigabit LAN & IPMI Remote Management
Slimline DVD-RW Dual Layer Drive
RAID Controller Battery Backup Module ( LSIiBBU07)
3U Rackmount rail kit included
2x 250Gb 2.5" Drives for Operating System (RAID 1 - Mirrored)

With of course 16 X 1.5TB 7.2k SATA Hard Drives

It would be really appreciated if you could please let me know how my current plan is flawed :)

Many Thanks



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