[Gluster-users] GlusterFS Changing Hash of Large Files?

Matthew Evans runmatt at live.com
Sat Jul 27 13:30:31 UTC 2019

Hi Ravishankar - I figured out the issue. The 4th node was showing "online" under 'gluster peer status' as well as 'gluster volume status' - but 'gluster volume status' wasn't showing a TCP port for that 4th node. When I opened 49152 in firewalld and then re-copied the ISO, the hash didn't change.

So, now I guess the question would be, why would having one malfunctioning node override 3 functioning nodes and cause a file to be altered? I wasn't performing the initial copy onto the malfunctioning node.

matt at docker1:~$ sudo glusterfs --version
glusterfs 6.3

matt at docker1:~$ sudo gluster volume info

Volume Name: swarm-vols
Type: Replicate
Volume ID: 0b51e6b3-786e-454e-8a16-89b47e94828a
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 4 = 4
Transport-type: tcp
Brick1: docker1:/gluster/data
Brick2: docker2:/gluster/data
Brick3: docker3:/gluster/data
Brick4: docker4:/gluster/data
Options Reconfigured:
performance.client-io-threads: off
nfs.disable: on
transport.address-family: inet
auth.allow: 10.5.22.*

From: Ravishankar N <ravishankar at redhat.com>
Sent: Saturday, July 27, 2019 2:04 AM
To: Matthew Evans <runmatt at live.com>; gluster-users at gluster.org <gluster-users at gluster.org>
Subject: Re: [Gluster-users] GlusterFS Changing Hash of Large Files?

On 26/07/19 6:50 PM, Matthew Evans wrote:
I've got a new glusterfs 4 node replica cluster running under CentOS 7.  All hosts are backed by SSD drives and are connected to a 1Gbps Ethernet network. 3 nodes are running on CentOS 7 under ESXi on the same physical host, 1 is running on CentOS 7 under Hyper-V. I use this for my docker swarm persistent storage and all seems to work well.

Yesterday however, I copied a 4GB .ISO file to my volume for a friend to download. I noticed the SHA256 hash of the ISO was altered. I downloaded a fresh copy to my desktop, verified the hash, scp'd it to the local glusterfs host storage and again, re-verified the hash. The moment I copied it to my glusterfs volume, the file hash changed. When my friend downloaded the ISO, his hash matched changed hash.
Can you provide the below details?
- glusterfs version

-`gluster volume info`

I am new to glusterfs, having deployed this as my first cluster ever about a week ago. Can someone help me work through why this file's hash would be changing?

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