Bug 865960

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Hi Jaroslav, any chance you could try and reproduce with scsi-target-utils in Fedora 20? There was some buffer management improvements since rhel6's tgtd version that may have resolved this.

I don't have F20 here, could you pls send me the version (string) that should have that fixed? I'll download/rebuild it on rhel6.

Uploaded a test build of 1.0.25 to http://fedorapeople.org/~grover/bug-865960/ , please give that a go.

[root@virt-122 ~]# for i in `seq 1 1000`; do tgtadm --mode target --op show | grep 'Target' | wc -l ; done | sort | uniq -c
    973 886
     16 887
      6 888
      5 889

scsi-target-utils-1.0.25-1.el6.x86_64

It seems that it's a bit better, but still giving inconsistent results.

ok thanks for trying that, I'll take a closer look.

I'm having difficulty reproducing this issue.

[agrover@localhost tmp]$ cat /tmp/ll.txt | sort | uniq -c
  10000 1000

What I did:

- create a vm with 4GB and 4 CPUs, and a 30GB block device /dev/vdb
- pvcreate /dev/vdb
- vgcreate mucho /dev/vdb
- for i in `seq 1 1000`; do lvcreate mucho -n blah$i -L 10m; done;
- for i in `seq 1 1000`; do echo -e "<target iqn.2008-09.com.example:foo$i>\nallow-in-use yes\ninitiator-name CLUSTER54\nscsi_id beaker-disk-54-1\nscsi_sn beaker-disk-54-1\nwrite-cache off\nbacking-store /dev/mucho/blah$i\n</target>\n">>targets2.conf; done;

window 1:
- sudo tgtd -f

window 2:
- tgtadm --op update --mode sys --name State -v offline
- tgt-admin -e -c targets2.conf
- tgtadm --op update --mode sys --name State -v ready
- for i in `seq 1 10000`; do sudo tgtadm --mode target --op show|grep -E iqn|wc -l >>/tmp/ll.txt; done

and I'm not seeing variability. Any ideas what the difference in our setups might be?

Created attachment 918631 [details]
targets.conf

I was able to reproduce it with the attached configuration on bare metal server.


# service tgtd start
Starting SCSI target daemon: [  OK  ]


# for i in `seq 1 10000`; do tgtadm --mode target --op show | grep -E 'Target' | wc -l  >> /tmp/ll.txt; done

# cat /tmp/ll.txt | sort | uniq -c
   9232 1000
      1 980
      3 982
      7 985
     18 986
      4 987
     10 988
     17 989
     30 990
     32 991
     52 992
     31 993
     84 994
     50 995
     86 996
    122 997
    189 998
     32 999

Used RHEL-6.5 (scsi-target-utils-1.0.24-10.el6.x86_64) to reproduce the problem.

can reproduce. fix in hand.

Verified that with the patch it is working fine now.

# rpm -q scsi-target-utils
scsi-target-utils-1.0.24-15.el6.x86_64

# for i in `seq 1 10000`; do tgtadm --mode target --op show | grep -E 'Target' | wc -l  >> /tmp/ll.txt; don

# cat /tmp/ll.txt | sort | uniq -c
  10000 1000

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2014-1599.html