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...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Gluster Storage
Classification: Red Hat Storage
Component: heketi
Version: cns-3.10
Hardware: Unspecified
OS: Unspecified
unspecified
high
Target Milestone: ---
: CNS 3.10
Assignee: Raghavendra Talur
QA Contact: Neha Berry
URL:
Whiteboard:
Depends On:
Blocks: 1568862
TreeView+ depends on / blocked
 
Reported: 2018-06-27 05:37 UTC by Neha Berry
Modified: 2018-09-12 09:24 UTC (History)
10 users (show)

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.
Clone Of:
Environment:
Last Closed: 2018-09-12 09:23:45 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2018:2686 0 None None None 2018-09-12 09:24:56 UTC

Comment 6 Raghavendra Talur 2018-07-09 12:49:21 UTC 
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 13:03:11 UTC 
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 2018-07-10 02:30:58 UTC 
This is a bug in heketi and I have a patch ready. Providing acks.
Comment 13 Raghavendra Talur 2018-07-12 09:32:42 UTC 
Patch posted at https://github.com/heketi/heketi/pull/1256
Comment 14 Humble Chirammal 2018-07-13 06:34:47 UTC 
Fixed in version : rhgs-volmanager-rhel7:3.3.1-20
Comment 17 Anjana KD 2018-08-30 23:56:01 UTC 
Updated doc text in the Doc Text field. Please review for technical accuracy.
Comment 19 Anjana KD 2018-09-07 17:59:08 UTC 
Thankyou John 

I have updated the doc text based on the feed back.
Comment 20 John Mulligan 2018-09-07 18:37:56 UTC 
Doc Text looks OK
Comment 22 errata-xmlrpc 2018-09-12 09:23:45 UTC 
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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