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RE: [dm-devel] open-iscsi + dm-multipath



Can you share more information on your hardware configuration and
applicable configlet specifications? Thanks,

Ramesh. 

-----Original Message-----
From: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com]
On Behalf Of Christophe Varoqui
Sent: Wednesday, March 23, 2005 8:34 AM
To: device-mapper development
Subject: Re: [dm-devel] open-iscsi + dm-multipath

On Tue, Mar 15, 2005 at 03:51:04PM -0800, Dmitry Yusupov wrote:
> On Tue, 2005-03-15 at 23:48 +0100, christophe varoqui wrote:
> > On sam, 2005-03-12 at 12:03 -0800, Dmitry Yusupov wrote:
> > > Hi Guys!
> > > 
> > > had anyone tried to setup open-iscsi with dm-multipath yet?
> > > I think it should work out of the box, but would be cool if
someone will
> > > double check on that.
> > > 
> > > PS: www.open-iscsi.org is a new cool project which features some
> > > noticeable performance improvements for soft-based iSCSI Initiator
plus
> > > other number of exciting abilities such as independent transport
and
> > > better user-space vs. kernel split. Read more on project's web
page.
> > > 
> > I tried on Monday, but I'm stuck before dm-multipath kicks into
play.
> > Build runs ok, modules load into the kernel, daemon starts up, but
the
> > admin tool remain desparetely silent to all commands I stuffed at
it.
> > 
> > What is even more weird is that the daemon (in debug mode) remains
> > silent too.
> 
> it easily could be a bug in open-iscsi. We just released new bits,
some
> of the issues got fixed since than. Would be cool, if you could give
it
> one more try. Kernel requirement changed since than as well. Now you
> will need kernel >= 2.6.11 because of a bug in netlink interface.
> 
Tested, it works perfectly :

2 streaming reads, 1 on each of these iSCSI LU (36GB 10Krpm JBODs):

2b1c15ceb02796769
[size=33 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [active][first]
  \_ 1:0:0:0 sdb  8:16    [ready ][active]
  \_ 2:0:0:0 sde  8:64    [ready ][active]
  \_ 3:0:0:0 sdh  8:112   [ready ][active]
  \_ 4:0:0:0 sdk  8:160   [ready ][active]
  \_ 5:0:0:1 sdp  8:240   [ready ][active]
  \_ 6:0:0:0 sdq  65:0    [ready ][active]
  \_ 7:0:0:0 sdt  65:48   [ready ][active]
  \_ 8:0:0:0 sdw  65:96   [ready ][active]
  \_ 9:0:0:0 sdz  65:144  [ready ][active]

26353900f02796769
[size=100 MB][features="0"][hwhandler="0"]
\_ round-robin 0 [active][first]
  \_ 9:0:0:2 sdaa 65:160  [ready ][active]
  \_ 1:0:0:2 sdc  8:32    [ready ][active]
  \_ 2:0:0:2 sdf  8:80    [ready ][active]
  \_ 3:0:0:2 sdi  8:128   [ready ][active]
  \_ 4:0:0:2 sdl  8:176   [ready ][active]
  \_ 5:0:0:2 sdo  8:224   [ready ][active]
  \_ 6:0:0:2 sdr  65:16   [ready ][active]
  \_ 7:0:0:2 sdu  65:64   [ready ][active]
  \_ 8:0:0:2 sdx  65:112  [ready ][active]

... gives this multipathed io profile :

Device:    rrqm/s wrqm/s   r/s   w/s  rsec/s  wsec/s    rkB/s    wkB/s
avgrq-sz avgqu-sz   await  svctm  %util
sda          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdb        708,67   0,00 26,67  0,00 5877,33    0,00  2938,67     0,00
220,40     0,21    7,75   6,45  17,20
sdc          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdd        772,33   0,00 27,67  0,00 6400,00    0,00  3200,00     0,00
231,33     0,22    7,94   6,10  16,87
sde        707,33   0,00 26,00  0,00 5866,67    0,00  2933,33     0,00
225,64     0,23    8,92   6,22  16,17
sdf          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdg        771,33   0,00 28,67  0,00 6400,00    0,00  3200,00     0,00
223,26     0,22    7,53   5,72  16,40
sdh        707,67   0,00 25,67  0,00 5866,67    0,00  2933,33     0,00
228,57     0,24    9,51   6,55  16,80
sdi          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdj        772,67   0,00 27,33  0,00 6400,00    0,00  3200,00     0,00
234,15     0,23    8,30   5,99  16,37
sdk        707,67   0,00 25,67  0,00 5866,67    0,00  2933,33     0,00
228,57     0,23    8,83   6,81  17,47
sdl          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdm        761,00   0,00 27,00  0,00 6301,33    0,00  3150,67     0,00
233,38     0,18    6,68   5,48  14,80
sdn        742,67   0,00 27,00  0,00 6157,33    0,00  3078,67     0,00
228,05     0,21    7,85   5,86  15,83
sdo          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdp        723,67   0,00 26,33  0,00 6005,33    0,00  3002,67     0,00
228,05     0,24    8,89   6,51  17,13
sdq        741,00   0,00 25,67  0,00 6133,33    0,00  3066,67     0,00
238,96     0,24    9,19   7,08  18,17
sdr          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sds        772,00   0,00 27,67  0,00 6400,00    0,00  3200,00     0,00
231,33     0,23    8,20   6,36  17,60
sdt        739,67   0,00 27,00  0,00 6133,33    0,00  3066,67     0,00
227,16     0,25    9,35   7,31  19,73
sdu          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdv        771,00   0,00 29,00  0,00 6400,00    0,00  3200,00     0,00
220,69     0,26    8,92   7,13  20,67
sdw        741,00   0,00 25,67  0,00 6133,33    0,00  3066,67     0,00
238,96     0,24    9,18   7,12  18,27
sdx          0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdy        772,33   0,00 27,67  0,00 6400,00    0,00  3200,00     0,00
231,33     0,24    8,82   6,71  18,57
sdz        739,67   0,00 27,00  0,00 6133,33    0,00  3066,67     0,00
227,16     0,25    9,19   6,48  17,50
sdaa         0,00   0,00  0,00  0,00    0,00    0,00     0,00     0,00
0,00     0,00    0,00   0,00   0,00
sdab       770,33   0,00 29,67  0,00 6400,00    0,00  3200,00     0,00
215,73     0,23    7,84   5,67  16,83

... which give around 110 MB/s

IET is the target implementation, running on a dual Xeon 2.8Ghz
Initiator is a dual Opteron 248
NICs are tg3 on both side, connected to a 3com low cost switch without
Jumbo Frames.

Hope it helps ...

Regards,
cvaroqui

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