Statistics

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Statistics

The Monitor-Statistics page allows you to view information about the traffic flowing through your jetNEXUS ALB-X. The page is split into four sections and organised below.

 

 

Total Input/Output

This statistic reports the raw data in and out of the ALB-X. The unit of measurement will change as the size grows from kbps to Mbps to Gbps

 

Compression

Content Compression to Date

This statistic reports how much compression the jetNEXUS ALB-X has achieved on compressible content. A typical percentage for this lies between 60-80%.

Overall Compression to Date

This statistic reports how much compression the jetNEXUS ALB-X has achieved on all
content. A typical percentage for this depends how many pre-compressed
images are contained on your services. The more images the smaller the
overall compression percentage is likely to be.

 

Hits and Connections

This section contains the overall statistics for hits and transactions.

Hit:
A hit is defined as a layer 7 transaction. Typically for web servers this is a GET for an object such as an image.

 

Connection:
A connection is defined as a layer 4 TCP connection. Many transactions can occur over 1 TCP connection.

 

Overall Hits Counted

This
is the cumulative number of non-cached hits since last reset. On
the right hand side the figure will show the current number of hits per
second.

Total Connections

This
is the cumulative number
of TCP connections since last reset. The first figure on the right hand
side you can see the number of TCP connections per second to the ALB-X.
The second number is the number of TCP connections per second
to the content servers.
Example 6/8 connections/sec – This means we
have 6 TCP connections per second to the Virtual Service and 6 TCP
connections per second to the real servers.

Peak Connections

This
is the maximum number of TCP connections to the jetNEXUS ALB-X.
The number on the right hand side gives the current number of active
TCP connections.

 

Caching

This section will show the
overall statistics in relation to caching when it has been applied to a
channel. If caching has not been applied to a channel and configured
correctly you will see 0 cache contents.

From Cache

Hits:

The first number gives the total number of
transactions served from the jetNEXUS ALB-X cache since last reset. A
percentage of total transactions is also provided.

 

Bytes:
The first number gives the total amount of data
in Kilobytes served from the jetNEXUS ALB-X cache. A percentage
of total data is also provided.

 

From Server

Hits:
The first number gives the total number of transactions served from
the content servers since last reset. A percentage of total
transactions is also provided.

 

Bytes:

The first number gives the total amount of data in Kilobytes served
from the content servers. A percentage of total data is also
provided.

 

Cache Contents

Hits:

This number gives the total number of objects contained in the jetNEXUS ALB-X cache.

 

Bytes:

The first number gives the overall size in Megabytes
of the jetNEXUS ALB-X cached objects. A percentage of the maximum cache
size is also provided.

 

Session Persistence

This is about all types of ALB session persistence. It shows total sessions, together with the new, revalidated and expired sessions. The figures are updated each minute.

 

From Session Persistence

Total current sessions:

Excluding ALB cookies, because they are stored on the client, this shows the total persistence sessions currently being managed by ALB.

 

% used (of max):

This shows how much of the session persistence capacity on ALB has been used. It is possible to expand the space used, if other facilities are not using too much resource, using jetPACKs.

 

New sessions this min:

A new session is one where a previously unseen token arrives and a new session is created for it. Depending on the load-balancing strategy in use, the token can be the IP address, ALB cookie value or cookie session token.

 

Revalidations this min:

A revalidated session is one where further transactions take place on a connection already associated with a session.

 

Expired sessions this min:

An expiry is when the persistence session timeout expires with no revalidation having taken place in that time.

 

Hardware

This section provides the overall usage stats for the jetNEXUS ALB-X.

Disk Usage

This number gives the percentage of disk space currently used and includes such things as the log files and the
cache which is periodically stored on the hard drive.

Memory Usage

This number gives the percentage of memory currently used. The larger number in brackets is the total amount of memory allocated to the ALB-X. It is recommended that this is a minimum of 2GB.

CPU Usage

This number gives the percentage of CPU currently used by jetNEXUS ALB-X. It is natural for this to fluctuate.

 

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