Bug 217246 - iscsid floods target with nop outs
Summary: iscsid floods target with nop outs
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: iscsi-initiator-utils
Version: 5.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
: ---
Assignee: Mike Christie
QA Contact: Brock Organ
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2006-11-25 19:52 UTC by Mike Christie
Modified: 2007-11-30 22:07 UTC (History)
2 users (show)

Fixed In Version: RC
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2007-02-08 00:54:29 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)

Description Mike Christie 2006-11-25 19:52:16 UTC
Description of problem:

Possible RHEL4/3 regression.

iscsid does not wait for a nop-out response before sending another one. This
then floods the target and the netlink interface with nop-out responses from the
target. And this prevents errors from the kernel from getting handled in a
timely manner and then causes problems with multipath and clustering software.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:

Set 

node.conn[0].timeo.noop_out_interval = 5

(this was the RHEL4 Active Ping interval)

run on a slow connection and watch "iscsid -d 8" or tcpdump/ethereal for a flood
of nop outs sent to the target.

iscsid also marks every nop as immediate. Some targets can only handle one
immediate request at a time, so this can result in different errors and problems
depending on the target.

Comment 2 RHEL Program Management 2006-11-28 02:08:00 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Comment 3 Jay Turner 2007-01-11 02:55:06 UTC
QE ack for RHEL5.

Comment 4 RHEL Program Management 2007-02-08 00:54:29 UTC
A package has been built which should help the problem described in 
this bug report. This report is therefore being closed with a resolution 
of CURRENTRELEASE. You may reopen this bug report if the solution does 
not work for you.



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