Target to localhost (ImageDisk On Ram Disk)

[Omnividente]

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

[anton (staff)]

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.

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]

only here?

or add device here too?

[anton (staff)]

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]

RAM disk emulator


Loopback

[Omnividente]

And MS initiator should be aware of.

how do I make it?

[anton (staff)]

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).

[anton (staff)]

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.

[Bohdan (staff)]

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

[Anatoly (staff)]

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]

i deleted it, but no effect on perfomance

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

yes

[Anatoly (staff)]

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]

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

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

[Anatoly (staff)]

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

[Omnividente]

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