On 02/10/2014 02:00 AM, Paul Cuzner wrote:
Hi,
I've started a new project on the forge, called gstatus.- wiki page is
https://forge.gluster.org/gstatus/pages/Home
The idea is to provide admins with a single command to assess the state
of the components of a cluster - nodes, bricks and volume states -
together with capacity information.
It's the kind of feature that would be great (IMO) as a sub command of
gluster i.e. gluster status - but as a stop gap here's the python
project (we could even use this as a prototype!)
On the wiki page, you'll find some additional volume status definitions
that I've dreamt up - online-degraded, online-partial, to describe the
effect brick down events have on a volume's data availability. There are
output examples on the wiki, but here's some examples to show you what
you currently get from the tool
On my test 4-way cluster, this is what a healthy state looks like
[root@rhs1-1 gstatus]# ./gstatus.py
Analysis complete
Cluster Summary:
Version - 3.4.0.44rhs Nodes - 4/ 4 Bricks - 4/ 4 Volumes - 1/ 1
Volume Summary
myvol ONLINE (4/4 bricks online) - Distributed-Replicate
Capacity: 64.53 MiB/19.97 GiB (used,total)
Status Messages
Cluster is healthy, all checks successful
And then if I take a *two nodes* down, that provide bricks to the *same
replica set*, I see;
Analysis complete
Cluster Summary:
Version - 3.4.0.44rhs Nodes - 2/ 4 Bricks - 2/ 4 Volumes - 0/ 1
Volume Summary
myvol ONLINE_PARTIAL (2/4 bricks online) - Distributed-Replicate
Capacity: 32.27 MiB/9.99 GiB (used,total)
Status Messages
- rhs1-4 is down
- rhs1-2 is down
- Brick rhs1-4:/gluster/brick1 is down/unavailable
- Brick rhs1-2:/gluster/brick1 is down/unavailable
This is great!
I think adding one more for the client stack would be neat. A tool
similar to nfsstat/nfsiostat which can expose various counters in
iostats xlator and also status information like brick connectivity from
the client perspective. I also have a cool name for that - glusteriostat ;)
Cheers,
Vijay
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