[stgt] tgt-admin and a -C, --control-port argument

ronnie sahlberg ronniesahlberg at gmail.com
Tue Apr 6 07:35:25 CEST 2010

I dont think that is viable for Chandra.

TGTD is pretty limited performance wise with its central eventloop. On
a many-core machine with a lot of memory
the central event loop quickly becomes a bottleneck.

For these usecases you really want to run multiple instances of tgtd.
In particular if you have a high-end storage subsystem attached
that can deliver high enough throughput.

Perhaps have one instance of TGTD for each 10GbE adapter. Perhaps one
instance of TGTD for every 2 cores.

But, some of us do need to run multiple tgtd processes in order to get
high enough throughput.

ronnie sahlberg

On Tue, Apr 6, 2010 at 12:45 PM, FUJITA Tomonori
<fujita.tomonori at lab.ntt.co.jp> wrote:
> On Mon, 05 Apr 2010 19:15:47 -0700
> Chandra Seetharaman <sekharan at us.ibm.com> wrote:
>> On Sun, 2010-04-04 at 16:49 +0900, FUJITA Tomonori wrote:
>> > On Sat, 3 Apr 2010 08:16:29 +1100
>> > ronnie sahlberg <ronniesahlberg at gmail.com> wrote:
>> >
>> > > What I think Chandra is asking about is if we plan to or want to make
>> > > tgtd listen on several addresses at once.
>> > > Right now tgtd can listen on one address, or on all addresses.
>> > >
>> > > Listening on several addresses I guess would look something like this
>> > > for iscsi :
>> > >  --iscsi portal=,
>> > >
>> > > Making tgtd listen on two addresses.
>> >
>> > I'm still not sure what he is asking but the above is fine by me.
>> > When we discussed 'portal' option, I think that we agreed the above
>> > option.
>> Consider the scenario where I have 8 ip addresses that are in different
>> subnets with 4 ip address in both subnets, and I want to export 4
>> targets in one subnet and another 4 targets in the other subnet.
>> The feature about is required to provide that kind of service.
> Can you live in most of situations if you run tgtd on all addresses
> then you configure ACL on each targets?
> For example, with the following command, only initiators on
> can discover and connect to #1 target.
> host:~/tgt# ./usr/tgtadm --lld iscsi --op bind --mode target --tid 1 -I
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