[Bugs] [Bug 1229267] Snapshots failing on tiered volumes (with EC)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1229267



--- Comment #3 from Mohammed Rafi KC <rkavunga at redhat.com> ---
I tried to reproduce this issue with latest master code. I'm able to create
snapshots during an ongoing I/O on mount.

My test scenario


volume :>>>>

Volume Name: patchy
Type: Tier
Volume ID: 358a6e6a-c0a2-4e3d-8260-2b83ac28c4b5
Status: Started
Number of Bricks: 6
Transport-type: tcp
Hot Tier :
Hot Tier Type : Distribute
Number of Bricks: 2
Brick1: 10.70.43.110:/d/backends/3/patchy_snap_mnt
Brick2: 10.70.43.100:/d/backends/3/patchy_snap_mnt
Cold Tier:
Cold Tier Type : Disperse
Number of Bricks: 1 x (3 + 1) = 4
Brick3: 10.70.43.100:/d/backends/1/patchy_snap_mnt
Brick4: 10.70.43.110:/d/backends/1/patchy_snap_mnt
Brick5: 10.70.43.100:/d/backends/2/patchy_snap_mnt
Brick6: 10.70.43.110:/d/backends/2/patchy_snap_mnt
Options Reconfigured:
cluster.tier-promote-frequency: 10
cluster.tier-demote-frequency: 10
cluster.write-freq-threshold: 0
cluster.read-freq-threshold: 0
performance.io-cache: off
performance.quick-read: off
features.ctr-enabled: on
performance.readdir-ahead: on



on mount point>>
tar -xvf /root/linux-4.1.2.tar.xz

on server (during I/O)>>

for i in {1..100} ; do  gluster snapshot create snap$i patchy
no-timestamp;done;

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