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тАО07-04-2010 01:06 AM
тАО07-04-2010 01:06 AM
Possible to add RAM or Additional NICs to HP Lefthand P4500
Does adding more RAM give more performance?
Does adding more Gbit NICs allow you to configure them through SAN/IQ?
I'm aware of the 10Gbit option, however looking at options to increase the number of Gbit ports.
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тАО07-04-2010 01:29 AM
тАО07-04-2010 01:29 AM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
sure it will work, if you add more RAM to the box, but I think it's no supported. Same for additional NICs. Only way to get more performance, if your network is the bottleneck, is to add the 10 GbE upgrade kits.
Regards,
Patrick
Patrick
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тАО07-04-2010 02:30 PM
тАО07-04-2010 02:30 PM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
So by adding more RAM you will not get any additional performance?
Also, by adding additional 1Gb NICs, you will not be able to use them?
Regards,
Aaron
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тАО07-04-2010 11:22 PM
тАО07-04-2010 11:22 PM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
yes, that's my opinion. It may work, but it's unsupported.
Regards,
Patrick
Patrick
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тАО07-06-2010 06:00 AM
тАО07-06-2010 06:00 AM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
Please correct this statement if it is incorrect.
If this statement is correct, then adding RAM will have negligible impact on performance.
The same goes for additional NIC's. You really need to read the iSCSI deep dive documentation at various locations on the net. A single 1 Gbe NIC will max out around 125 MB/sec depending on the TCP/IP overhead. Without MPIO adding more NIC's will not help on a per individual LUN basis. Each LUN will have a max of 125 MB/sec regardless of the number of nics and regardless of the disks in the unit.
With MPIO round robin, two nics should be capable of carrying 250 MB/sec of disk traffic. Since all LeftHand data is written randomly (not sequentially), I am not sure if 8 or 12 drives can fill a full 250 MB/sec. I suspect there are only some rare circumstances where you could fill two 1 Gbe pipes with purely random disk activity.
It would seem to me the biggest benefit of the 10 Gbe upgrade option is to increase the per LUN (session) limitation of 125 MB/sec for non-MPIO workloads.
Once again, if any of this is incorrect please post the correct information.
I hope that helps,
Kevin
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тАО07-06-2010 08:03 AM
тАО07-06-2010 08:03 AM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
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тАО07-06-2010 08:12 AM
тАО07-06-2010 08:12 AM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
;o)
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тАО07-06-2010 04:10 PM
тАО07-06-2010 04:10 PM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
In terms of going over 1Gbe per LUN, would using bonding of 2 NICs increase throughout to 250MB/s, or would we need to use MPIO? In our case MPIO is probably not an option. We would be looking at using stacking with the NIC bonding to esure no single point of failure.
Regards,
Aaron
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тАО07-07-2010 05:43 AM
тАО07-07-2010 05:43 AM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
Even if you have 10 Gbe on the Lefthand, if your server is only using 1 GB Nic's and non-MPIO, then you will still be limited to a 1 Gbe connection.
This is only per LUN! It should be obvious but for completeness sake, multiple LUN's will create multiple sessions which will naturally load balance across both nic's using a bond.
Another important consideration, if you are using 10 Gbe on your server and 10 Gbe on the Lefthand, but you have trunked 1 Gbe connections between switches. Assuming your LeftHand might be on different switching infrastructure, then you will still be limited to the 1 Gbe of the trunk for an individual LUN (session).
I hope that is pretty clear.
Kevin
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тАО07-07-2010 05:54 PM
тАО07-07-2010 05:54 PM
Re: Possible to add RAM or Additional NICs to HP Lefthand P4500
Yes thanks, that definitely helps.
Have a few more questions regarding it still, in the HP documentation it has several different methods of LB connections: http://h10032.www1.hp.com/ctg/Manual/c01750150.pdf
* Link Aggregation - 802.3ad
* Adaptive Load Balancing (Recommended)
With either of these options, is it not possible to reach 2Gbit/s on a single LUN? I was under the improession with link aggregation it is possible to balance traffic based on MAC address (when doing it on a switch), however not sure how HP does it.
On our front end nodes we would probably be doing a similar thing, 2Gbit/s link aggregation.