[stgt] tgtadm: this target already exists - with >100 targets

Konstantin Skaburskas konstan at sixsq.com
Wed Jul 4 09:45:58 CEST 2012

Thanks for your prompt reply and sorry for the delay with mine.

This particular installation is on Fedora 14 with 
scsi-target-utils-1.0.18-2.fc14.x86_64. Unfortunately, we can't 
stop/update tgtd now as the system is under heavy use.

We certified our system on CentOS 6.2 as well, but there I see even 
older version :(

How do you roll out the latest stable releases for CentOS? Or we will 
have to build it?

Thank you,

On 7/3/12 6:13 PM, FUJITA Tomonori wrote:
> On Tue, 03 Jul 2012 16:03:32 +0200
> Konstantin Skaburskas <konstan at sixsq.com> wrote:
>> Hi,
>> We use tgtd with >100 targets and from time to time we see failures of
>> tgt-admin --update <iqn>
>> with iqn predefined in a conf file. The reported failures are
>> # Adding target: test_aaa
>> tgtadm -C 0 --lld iscsi --op new --mode target --tid 401 -T test_aaa
>> tgtadm: this target already exists
>> Command:
>>      tgtadm -C 0 --lld iscsi --op new --mode target --tid 401 -T test_aaa
>> exited with code: 22.
>> We discovered that calculation of 'tid' value happens in tgt-admin and
>> it seems like if tgtd is under a relatively high load
>> sub process_targets {
>> ...
>>     my @show_target = `tgtadm -C $control_port --op show --mode target`;
>> doesn't actually get the full list of targets, and then later on
>> calculated $next_tid actually clashes with already existing target id.
> Sounds like mgmt bugs.
> What version you use? The mgmt code was rewritten in 1.0.25 so it
> would be great if you could try 1.0.24 and the latest.
> Thanks.

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