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Windows 7: 100mbs speed limit on a Gigabit network to a iSCSI SAN.

23 Dec 2014   #1

windows 7 Ultimate 64bit
100mbs speed limit on a Gigabit network to a iSCSI SAN.

Hi Guys,

I haven't been on this forum until now.

I have a Equallogic PS400 SAN, connected to a Powerconnect 6248 gigbit switch. Everything runs FINE on 2k8 server, Windows 2012r2 and VMware ESXi 5.1.

I created a iSCSI target for my wifes new pc which is based on a Gigbabyte MB, Gigabyte-970a-ud3, with a AMD FX-6100 hexacore CPU 4.2 Ghz , 16gGB DDR3 ram. Boot disks are a pair of SSD 240GB drives striped for even more speed.

Local storage is 4 2TB WD sata3( 6gbs) disks in a stripe for speed. I added a PCIe expansion card for a extra pair of 2TB disks (software striped) also SataIII (6gbs sec)
The network is a quad port Intel vt-100 server class nic. I have NO latency or retransmits on the network, Flow control is on and set up per Equallogic best practices.

There is 2.7 TB of movie ISO's on the 2TB stripe i want to move off to an iSCSI 6TB volume on my san.

Got it?

Here is the kicker , I can easlily move the data from the 2TB stripe to the 8TB stripe using robocopy, teracopy , etc. and it hauls butt and i get 120MB/ sec internal to internal SATA.
Theorectically (and in practice as i have a 2k8 server and 2012 server) i should be able to get 125MBs/ sec on my iSCSI san. I can never get anything more than 12.5MBs / Sec to the iSCSI target, the network transfer maxes out at 100mbs period. No matter what I do , the max network transfer of copying files is 100mbs and 12.5MBs from the windows 7 box. All of my other systems easily get the 100MBs /sec . I read that the issue is a QOS issue with Windows 7 (all of them) I'm running Windows 7 Ultimate 64 bit. I can run IOmeter on the nics to the iscsi target and easily get the 250mbs I would expect. Whenever I try to copy data from either internal stripe to the iSCSI target , it Max's out @ 100mbs and 12.5MBs .

From looking into it more it sounds like a QOS issue with Windows 7 network speed limit. I setup a QOS policy to allow iSCSI port 3260 to have a limit of 600gbs. Still no change , 100mbs / 12.5MBs..

Any ideas?

Thanks in advance


My System SpecsSystem Spec
24 Dec 2014   #2

windows 7 Ultimate 64bit

Can one of the mods move this to the performance thread. Its not a network or sharing issue.Its a performance QOS issue.
My System SpecsSystem Spec
21 Jan 2016   #3

7 ultimate 64-bit

I'm having this same issue, I've ghosted a windows 7 64-bit install from a drive to an ISCSI lun. Works perfectly except that actual disk access never goes above 100mbit/s on Gigabit link. Were you able to find any solution?
My System SpecsSystem Spec


 100mbs speed limit on a Gigabit network to a iSCSI SAN.

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