Bug 1595535 – In a 4 node CNS cluster, need to pass 3 hosts from heketi for gluster-block cli when HA is 3, instead of all 4 IPs

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Bug 1595535 - In a 4 node CNS cluster, need to pass 3 hosts from heketi for gluster-block cli when HA is 3, instead of all 4 IPs

Summary:	In a 4 node CNS cluster, need to pass 3 hosts from heketi for gluster-block c...

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Gluster Storage
Classification:	Red Hat
Component:	heketi (Show other bugs)
Sub Component:
Version:	cns-3.10
Hardware:	Unspecified Unspecified

Priority	unspecified Severity high
Target Milestone:	---
Target Release:	CNS 3.10
Assigned To:	Raghavendra Talur
QA Contact:	Neha Berry
Docs Contact:

URL:
Whiteboard:
Keywords:

Depends On:
Blocks:	1568862
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Reported:	2018-06-27 01:37 EDT by Neha Berry
Modified:	2018-09-12 05:24 EDT (History)
CC List:	10 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	Previously, because of an off by one error, Heketi added one host more than ha count to the list of hosts provided to gluster-block cli during block volume create. This lead to the incorrect usage of one extra node. With this fix, the number of hosts used for iscsi targets is equal to ha count parameter.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-09-12 05:23:45 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHEA-2018:2686	None	None	None	2018-09-12 05:24 EDT

Groups: None (edit)

Comment 6 Raghavendra Talur 2018-07-09 08:49:21 EDT

hacount is optional. If heketi isn't provided one, it adds all the nodes in the cluster as a host.

However, if ha count is provided, heketi chooses hosts==hacount.

The problem in heketi today is that the selection of hosts is always a for loop over the same list, hence we lose out on distributing the targets across the cluster.

Comment 7 Raghavendra Talur 2018-07-09 09:03:11 EDT

From heketi code,

gluster-block create %v/%v  ha %v auth %v prealloc full %v %vGiB --json

So, heketi sends only as many hosts as in ha count. Is it possible that gluster-block creates target on 4th node as it belongs to the same trusted storage pool?

Comment 9 Raghavendra Talur 2018-07-09 22:30:58 EDT

This is a bug in heketi and I have a patch ready. Providing acks.

Comment 13 Raghavendra Talur 2018-07-12 05:32:42 EDT

Patch posted at https://github.com/heketi/heketi/pull/1256

Comment 14 Humble Chirammal 2018-07-13 02:34:47 EDT

Fixed in version : rhgs-volmanager-rhel7:3.3.1-20

Comment 17 Anjana 2018-08-30 19:56:01 EDT

Updated doc text in the Doc Text field. Please review for technical accuracy.

Comment 19 Anjana 2018-09-07 13:59:08 EDT

Thankyou John 

I have updated the doc text based on the feed back.

Comment 20 John Mulligan 2018-09-07 14:37:56 EDT

Doc Text looks OK

Comment 22 errata-xmlrpc 2018-09-12 05:23:45 EDT

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.

https://access.redhat.com/errata/RHEA-2018:2686

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