Regarding the number of RAID10 array to use, do you think
that 2 X RAID10 arrays (6 disks each) + 4 hot spares would be a good compramise?
I'm trying to get the best IOPS for the level of hardware I'm using.
From: Robert Dunkley
[mailto:Robert@xxxxxxxxx]
Sent: Thu 17/06/2010 14:33
To:
Jonathan Tripathy
Cc: kriegisch@xxxxxxxx
Subject: RE:
[Xen-users] RAID10 Array
Hi
Jonathan,
Theoretical
would be 2Gbit to the Nodes and 4Gbit to the Storage so 2 nodes could for
example get 2gbit bandwidth each simultaneously but this does come with some
loss in practice and additional CPU overhead.
The
ATA load balance type situation described in the previous email allows 1gb to
any one node from a single device on the storage server but up to 4 nodes could
drag 1gbit each simultaneously from the storage server. Considering how many
nodes you are planning the load balanced scenario might even be preferable to
LACP/802.3AD as long as the ATAoE target software can do a good job due to
potentially lower CPU overhead and easier implementation of multiple switches
for redundancy.
None
of these software decision will affect your hardware choice so its portably
about time you got your hands dirty J
Rob
From: Jonathan
Tripathy [mailto:jonnyt@xxxxxxxxxxx]
Sent: 17 June 2010
14:19
To: Robert Dunkley;
xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] RAID10
Array
And if I was to use let's say 4 teamed ports coming out of
the storage server, and 2 teamed ports going into the xen node, would the
max I'd get be still 1Gbit?
From: Robert Dunkley
[mailto:Robert@xxxxxxxxx]
Sent: Thu 17/06/2010 14:15
To:
Jonathan Tripathy
Subject: RE: [Xen-users] RAID10
Array
Hi
Jonathan,
LACP
and 802.3AD are used together on those HP Soho switches. I might be wrong but
LACP I think allows automatic negotiation to some degree at the switch side.
I
have used LACP with Broadcom based NICs in Windows and the HP switch you are
looking at. You only need to enable LACP on the switch ports plugged into your
disk box and then the software on the server should be able to sort the rest (I
enabled it with Broadcom NICs under Windows and it worked as
advertised).
Rob
From:
xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jonathan
Tripathy
Sent: 17 June 2010 14:07
To: Adi Kriegisch;
xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] RAID10
Array
From: Adi Kriegisch
[mailto:kriegisch@xxxxxxxx]
Sent: Thu 17/06/2010 14:03
To:
Jonathan Tripathy
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject:
Re: [Xen-users] RAID10 Array
Hi!
> Looking at this page https://help.ubuntu.com/community/HighlyAvailableAoETarget
>
they seem to have made a linux "bond" called bond0 and are telling the
AoE
> target to use that. This confuses me...
> Would it be of any
benifit to create a "mode 4" bond and use 802.3ad with ATA
> over
Ethernet? Or would that be just a waste, when AoE can use the interfaces
>
directly?
ggaoed for example can handle multiple interfaces in the
configuration and
is designed to deliver highest performance with for example
automatically
load balancing over several NICs.
If you want to use vblade
you might be better off using bonding because
vblade cannot handle several
interfaces in one instance. You'll get another
performance penalty when using
several instances of vblade listening on
different interfaces.
I am not
sure if LACP enhances performance in your case: I think from one
server to
the other you will only get 1GBit; for LACP to work as expected
you need
many-to-many or many-to-one connections. All pakets belonging to a
connection
will use the same wire. This article has some
details: http://serverfault.com/questions/8512/multiplexed-1-gbps-ethernet
also
Wikipedia has some information on this.
Another thing is that you loose
the ability of having a redundancy in the
switching backend.
--
Adi
-------------------------------------------------------------------------------------------------------------------
So if I use ggaoed and just put all 4 NICs into
its config file, that should allow me to get 4Gbit of bandwidth? And no
configuration is required on the switch?
BTW, does 802.3ad "mode 4" use LACP? Or I am
getting mixed up?
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The
SAQ Group
Registered
Office: 18 Chapel Street, Petersfield, Hampshire GU32 3DZ
SAQ
is the trading name of SEMTEC Limited. Registered in England &
Wales
Company Number: 06481952
http://www.saqnet.co.uk AS29219
SAQ
Group Delivers high quality, honestly priced communication and I.T. services to
UK Business.
Broadband :
Domains : Email : Hosting : CoLo : Servers : Racks : Transit : Backups : Managed
Networks : Remote Support.
![SAQ Group]()
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