Proxmox VE 1.5 - Network issues?

  • Thread starter Thread starter TiagoRF
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T

TiagoRF

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Hello all,

We're implementing a new Proxmox solution in a customer, and we've been facing some odd """"""problems""""""

It's a DELL R710, 24GB of RAM, 6 NICs (4 broadcom, 2intel (for drbd))

RAID 1 2x146GB SAS 10k

RAID 10 4x450GB SAS 10k

After setting up the SQL machine, we ran some tests, one of which was a single ping -t ip

our times were:

<1
<1
<1
3
8
4
<1
=1

and following that unstable path.

The machine has VirtIO disks, and NICs.

It can't stand regular <1ms, which I find quite bizarre.

I can't risk an intensive infrastructure around 200 people everyday using SQL server and having such differences in ping replies.

happened to any of you?

cheers, and thanks in advance

TF
 
I recommend against the VirtIO disks on Windows SQL Server machines for now. Those things need way too much work. During my testing last December, I encountered some really bad disk interrupt request behaviour during high IO operations such as SQL backup/restore and mirror failovers. The IR problem was so bad the Win2k3 machines' internal clocks fell behind minutes on the hour. The time problem also caused odd ping response times. I even signed up for a trial of RHEL 5.4 so I could download their signed Windows drivers package and got the same results.

For our production Proxmox machines, I switched to a RAW disks + IDE bus + Virtio NIC recipe. This eliminated the system interrupt problems. Those SQL machines have been running since first week of January averaging 35k transactions per minute. Average daily IOPS is around 1.5 mb/s with bursts to 50 mb/s during nightly automated maintenance activities.

I would like to test Red Hat's VirtIO Windows drivers on one of their distro's new KVM hosting environments to see if there is any performance difference. Unfortunately I got such a run-around last year from RHEL sales person, it's very low on my priority list. Another reason I now fly the Proxmox flag. :)
 
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When I get a chance, I also want to perform the same VirtIO tests on Proxmox 1.5 between disk images and LVM disks. How the VirtIO drivers and Windows OS behave at high IO > 50 IOS and CPU 100% load should be interesting. My Linux machines don't seem to have a problems with driving VirtIO disks. Bonnie++ always returns about 94% of the host's score for Debian VMs running RAW + VirtIO + Virtio NIC combos.
 
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