Bug 217246 - iscsid floods target with nop outs
iscsid floods target with nop outs
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: iscsi-initiator-utils (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Mike Christie
Brock Organ
Depends On:
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Reported: 2006-11-25 14:52 EST by Mike Christie
Modified: 2007-11-30 17:07 EST (History)
2 users (show)

See Also:
Fixed In Version: RC
Doc Type: Bug Fix
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Last Closed: 2007-02-07 19:54:29 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Mike Christie 2006-11-25 14:52:16 EST
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:
Actual results:

Expected results:

Additional info:


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 Product and Program Management 2006-11-27 21:08:00 EST
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
Comment 3 Jay Turner 2007-01-10 21:55:06 EST
QE ack for RHEL5.
Comment 4 RHEL Product and Program Management 2007-02-07 19:54:29 EST
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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