11%
24.02.2016
and doesn’t require much attention, others really want to understand exactly what is happening under the hood to further optimize the runtime of their applications, improve their monitoring, or port
11%
14.01.2016
. Be sure to keep a sys on it.
Info
3D XPoint: https://en.wikipedia.org/wiki/3D_XPoint
Layton, J., and Barton, E. "Fast Forward Storage & IO," http://storageconference.us/2014/Presentations
11%
16.06.2015
), or very large clusters might need nodes dedicated to monitoring the cluster or to logging in users to the cluster and running applications.
For a simple two-node cluster that you might use as your
33%
17.12.2014
performance from many perspectives (i.e., CPU, network, disk). The tool is called nmon
.
Nmon Overview
Nmon is short for “Nigel’s Monitor” and is a command-line tool that presents performance information ... Monitoring with Nmon
13%
19.11.2014
local or remote, in your browser using websocketd. Although I won't go into it in depth, Web-vmstat does a pretty good job monitoring problem servers. For example, if a node has been exhibiting strange
58%
07.10.2014
Jeff Layton ... ). Problems that crop up usually mean no X Window system or any other sort of GUI access to the server. Often, this also means that monitoring tools such as Ganglia [1] aren't giving you much or any information
10%
27.08.2014
of I/O, but it is also useful to look further down the stack to see how the I/O requests appear at the various layers. One layer that is useful to monitor is the block layer, which is near the bottom
11%
30.07.2014
claims to “handle approximately 160,000 distinct metrics per minute running on two niagra-2 Sun servers on a very fast SAN” [1]. Graphite is thus best used in environments that need to monitor thousands
10%
02.07.2014
examining local I/O (if the nodes are doing local I/O)
checking whether any nodes are swapping
spot-monitoring the compute nodes
The real list of possible tasks is extensive, but anything you want
10%
18.06.2014
and more than 1PB of data? Moreover, the answers constantly change because users are adding, modifying, and deleting data, but understanding – or at the very least, monitoring – your filesystem holistically