>>> Learner Study <learner.st...@gmail.com> schrieb am 27.08.2014 um 02:13 in
Nachricht
<CAP8+hKW=HApS+=vxeaaibtbbd7yzndu4squt+84se99aglc...@mail.gmail.com>:
> Hi Mike,
> 
> Thanks for suggestions....
> 
> I think you meant,
> 
> echo 1 > /sys/block/sdX/device/delete
> 
> I don't see /sys/block/sdX/device/remove in my setup.

I'm not sure: Is it "echo offline > /sys/block/sdX/device/state", "echo "scsi 
remove-single-device" ${host} ${channel} ${id} ${lun} > /proc/scsi/scsi", or 
"echo 1 > /sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/delete"?

> 
> How do following FIO options look?
> 
> [default]
> rw=read
> size=4g
> bs=1m
> ioengine=libaio
> direct=1
> numjobs=1
> filename=/dev/sda
> runtime=360
> iodepth=256
> 
> Thanks for your time!
> 
> 
> On Tue, Aug 26, 2014 at 4:49 PM, Michael Christie <micha...@cs.wisc.edu> 
> wrote:
>>
>> On Aug 26, 2014, at 3:11 PM, Learner <learner.st...@gmail.com> wrote:
>>
>>> Another related observation and some questions;
>>>
>>> I am using open iscsi on init with IET on trgt over a single 10gbps link
>>>
>>> There are three ip aliases on each side
>>>
>>> I have 3 ramdisks exported by IET to init
>>>
>>> I do  iscsi login 3 times, once using each underlying ip address and notice 
> that each iscsi session sees all 3 disks.
>>>
>>> Is it possible to restrict such that each init only sees one separate disk?
>>>
>>
>> There is no iscsi initiator or target setting for this. The default is to 
> show all paths (each /dev/sdx is a path to the same device)..
>>
>> You would have to manually delete some paths by doing
>>
>> echo 1 > /sys/block/sdX/device/remove
>>
>>> When I run fio on each mounted disk, I see that only two underlying tcp 
> sessions are being used - that limits the perf.
>>> Any ideas on how to overcome this?
>>
>> How are you matching sessions with devices? It should just be a matter of 
> running fio on the right devices. If you run:
>>
>> iscsiadm -m session -P 3
>>
>> you can see how the sdXs match up with sessions/connections. If you run fio 
> to a /dev/sdX from each session, you should be seeing IO to all 3 sessions.
>>
>>
>>
>>
>>>
>>> Thanks!
>>>
>>>
>>> Sent from my iPhone
>>>
>>> On Aug 26, 2014, at 12:53 PM, "Mark Lehrer" <m...@knm.org> wrote:
>>>
>>>> On Tue, 26 Aug 2014 08:58:46 -0400 Alvin Starr <al...@iplink.net> wrote:
>>>>>
>>>>>>> I am trying to achieve10Gbps in my single initiator/single target
>>>>>>> env. (open-iscsi and IET)
>>>>>>
>>>>>> On a semi-related note, are there any good guides out there to
>>>>>> tuning Linux for maximum single-socket performance?  On my 40 gigabit
>>>>>
>>>>> You are likely getting hit by the bandwidth-delay product.
>>>>> Take a look at http://en.wikipedia.org/wiki/Bandwidth-delay_product 
>>>>> and http://www.kehlet.cx/articles/99.html 
>>>>
>>>> Thanks that helped get my netcat transfer up over 500MB/sec using IPoIB. 
> Unfortunately that is still only about 10% of the available bandwidth.
>>>>
>>>> I'll keep on tweaking and see how far I can take it.
>>>>
>>>> Thanks,
>>>> Mark
>>>>
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