Target to localhost (ImageDisk On Ram Disk)

Omnividente · Tue Oct 01, 2013 11:42 am

I create a RAM disk (by means of third-party software), then create the disk image with starwind img iscsi Target, and connect it to the same server. Speed drive connected to more than 10 times compared with a speed RAM disk. Why?

PS sorry for my bad english

Tue Oct 01, 2013 2:36 pm

1) This configuration is not supported. Even if you'd use StarWind RAM disk as a stand-alone information we're not going to support this. StarWind has own built-in stuff so please stick with it.

2) Because with iSCSI you run a TCP in a loopback and if you did not enable loopback optimization thing (I guess you did not, what's your OS BTW?) it would be much slower compared to just reading or writing the memory.

Omnividente wrote:I create a RAM disk (by means of third-party software), then create the disk image with starwind img iscsi Target, and connect it to the same server. Speed drive connected to more than 10 times compared with a speed RAM disk. Why?

PS sorry for my bad english

Omnividente · Tue Oct 01, 2013 4:51 pm

only here?

or add device here too?

Tue Oct 01, 2013 5:15 pm

It should be active (selected and applied) when you create the target. And MS initiator should be aware of. We do make it aware for our internal connections with Native SAN (vSAN).

Can you share any ATTO numbers for RAM disk emulator and iSCSI in a loopback?

Omnividente · Tue Oct 01, 2013 5:59 pm

RAM disk emulator

Loopback

Omnividente · Tue Oct 01, 2013 7:09 pm

anton (staff) wrote:And MS initiator should be aware of.

how do I make it?

Tue Oct 01, 2013 7:59 pm

Loopback acceleation does not work. You should be able to get ~2.5-3 GB/sec in a loopback from RAM disk. If you did "tick" the "loopback acceleration" when creating the target (checked by default) then something does not work. I'll point to this thread out developers so they would let you know how to verify it's working (or not).

Tue Oct 01, 2013 9:43 pm

Confirmed. Loopback acceleration DOES NOT work on a R2 and 8.1 so you'll have to wait for next Beta-2 (next week or so) to see the improvement. You'll have to use StarWind RAM disk (built-in one) either way.

Thu Oct 03, 2013 4:12 pm

Are you using 127.0.0.1 as a target portal in iSCSI initiator?

Fri Oct 04, 2013 10:00 am

Quick question - why have you installed this one?

Cause as far as I know you don`t need it. Moreover it can affect the system in one way or another.

thanks

Omnividente · Mon Oct 07, 2013 8:24 pm

i deleted it, but no effect on perfomance

Are you using 127.0.0.1 as a target portal in iSCSI initiator?

yes

Wed Oct 09, 2013 3:35 pm

As far as I know you should use 127.0.0.1, and nothing else.

Also we are still waiting for your answer to my question.

Thanks

Omnividente · Wed Oct 09, 2013 8:57 pm

Anatoly (staff) wrote:Also we are still waiting for your answer to my question.

question? You mean this http://www.starwindsoftware.com/forums/ ... tml#p19662 ?

Thu Oct 10, 2013 8:15 am

Nope, I mean http://www.starwindsoftware.com/forums/ ... tml#p19636

Omnividente · Thu Oct 10, 2013 8:54 am

because I have not seen the performance of StarWind loopback and I try to specify this interface as a Target Portal for testing. Not a good idea