Bug 1299708

Summary:	[Nimble Storage] Unnecessary wait on stand-by paths for TUR in rescan-scsi-bus.sh
Product:	Red Hat Enterprise Linux 6	Reporter:	shivamerla1 <shiva.krishna>
Component:	sg3_utils	Assignee:	Gris Ge <fge>
Status:	CLOSED WONTFIX	QA Contact:	guazhang <guazhang>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	6.7	CC:	bubrown, djez, guazhang
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-06 12:36:51 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description shivamerla1 2016-01-19 04:59:11 UTC

Description of problem:
rescan-scsi-bus.sh has testonline() function which issues TUR and retry 8 times with an interval of 1 second sleep. This is causing a huge delay in scanning large number of volumes if stand-by paths are present. TUR on stand-by paths return 2/4/0b check condition. This condition needs to be handled in rescan-scsi-bus.sh and avoid looping in testonline().

Also, udevadm settle calls are hanging and taking long time to complete.

Comment 2 shivamerla1 2016-01-19 05:18:29 UTC

testonline().
while test $RC = 2 -o $RC = 6 && test $ctr -le 2; do
    if test $RC = 2 -a "$RMB" != "1"; then echo -n "."; let LN+=1; sleep 1
    else usleep 20000; fi
    let ctr+=1
    sg_turs /dev/$SGDEV >/dev/null 2>&1
    RC=$?
  done


mpathje (215df250f8212599b6c9ce9001e319f94_1) dm-512 Nimble,Server
size=1.0G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 6:0:4:78   sdcf  69:48    active ready  running
| `- 7:0:5:78   sdzq  131:576  active ready  running
`-+- policy='round-robin 0' prio=1 status=enabled
  |- 6:0:7:78   sdka  65:480   active ghost  running
  `- 7:0:0:78   sdrv  134:400  active ghost  running

[root@hitdev-rhel67 ~]# sg_turs -v  /dev/sdka
    test unit ready cdb: 00 00 00 00 00 00 
test unit ready:  Fixed format, current;  Sense key: Not Ready
 Additional sense: Logical unit not accessible, target port in standby state
  Info fld=0x0 [0] 
device not ready

Comment 3 David Sommerseth 2016-01-20 17:23:03 UTC

I've had a brief discussion with upstream developers on this issue.  They are looking into this as well.

Comment 4 shivamerla1 2016-05-10 18:43:03 UTC

Can you provide any update on this?. Was the change made?.

Comment 6 Ondrej Vasik 2016-06-30 05:38:19 UTC

David left Red Hat - and we are in a process of searching for the new maintainer of sg3_utils package. Unfortunately - I don't see any clear pointer to David's discussion with upstream - based on lkml and recent activity, it seems sg3_utils is now maintained at https://github.com/hreinecke/sg3_utils ...

Comment 7 guazhang@redhat.com 2017-09-21 02:34:07 UTC

Hello

the sg3_utils testing has transfer to storage-QE team. so I will take the bug for  
testing.


thanks
guazhang

Comment 8 Jan Kurik 2017-12-06 12:36:51 UTC

Red Hat Enterprise Linux 6 is in the Production 3 Phase. During the Production 3 Phase, Critical impact Security Advisories (RHSAs) and selected Urgent Priority Bug Fix Advisories (RHBAs) may be released as they become available.

The official life cycle policy can be reviewed here:

http://redhat.com/rhel/lifecycle

This issue does not meet the inclusion criteria for the Production 3 Phase and will be marked as CLOSED/WONTFIX. If this remains a critical requirement, please contact Red Hat Customer Support to request a re-evaluation of the issue, citing a clear business justification. Note that a strong business justification will be required for re-evaluation. Red Hat Customer Support can be contacted via the Red Hat Customer Portal at the following URL:

https://access.redhat.com/