Urgent Problem i/o ;(

[javiercampos]

Do you have any additional configuration xenserver?
What version do you have? payment or free?

[Al-S]

What is the build of your Xenserver? is it the latest? as your xen might have an issue with your NIC drivers, did you checked for that!

[webguyz]

Do you have any additional configuration xenserver?
What version do you have? payment or free?

payment or free is the same as far as base functinality of xenserver goes. Prefer MPIO to bonding because you can get close to 2 gig throughput, but in bonding your still only getting 1 gig max throughput to any one server.

[javiercampos]

switch are using some special?

[webguyz]

using Dell 6248 with Gigabit ports. You need to make sure if using Jumbo Frames that its supported by your switch. Make sure your packets are not getting fragmented. Use something like this test from your xenservers to your DSS server ISCSI IP's: ping -M do -s 8972 -c 10 10.10.10.1 (where 10.10.10.1 is your dss ip addr) If the packets are fragmenting it will tell you, if they are ok then the repsone will be 10 normal looking ping responses.

Your Xenserver nics have to have MTU=9000 set and the same on the DSS side. On the Dell 6248 we have to set each port that we want to do Jumbo Frames to an MTU of 9016 which kicks it into Jumbo Frame mode. Check the docs for your switch to see if there is anything you have to do to enable JF's.

[javiercampos]

Hello,
I configured the server and storage with a crossover cable card directly to the storage server .. and gives the same result.

[webguyz]

Is this a production server? or are you in testing phase? if testing you might try using raid 10 instead of raid 5. What disk controller did you say you were using and how much cache does it have. I am assuming your using Block I/O.

Running out of ideas as to what your issue might be :-)

[javiercampos]

Is this a production server? or are you in testing phase? if testing you might try using raid 10 instead of raid 5. What disk controller did you say you were using and how much cache does it have. I am assuming your using Block I/O.

Running out of ideas as to what your issue might be :-)

Thanks for the reply.
Look at the raid card is:

LSI MegaSAS 9260

the issue that only allows me to do raid0, 1, 5 and 6 RAID10.
The other .. My storage has a capacity of 16 drives in raid1 2 are for the open-e system and I have raid5 array with 7 drives .. how rare such an arrangement of 7 discs I get the same performance as one with 3 disks.

and if I'm using Block I/O.

[lpatterson]

Hello,
I configured the server and storage with a crossover cable card directly to the storage server .. and gives the same result.

My guess is that you have a 100mb crossover cable and/or the nic in your host is only negotiating at 100mb. make sure you have a gigabit switch and not just a fast Ethernet switch. If you do not have a gigabit crossover check this link on how to make one. http://logout.sh/computers/net/gigabit/. When you said you are only getting the 9.1MB/sec rates that is the full throughput of 100mb Ethernet. expect 80-90MB/sec for gigabit.