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Packet ring buffer: Difference between revisions
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==== Cluster ring buffer ==== | ==== Cluster ring buffer ==== | ||
The cluster ring buffer feature allows to use multiple whole disks in parallel for a single packet ring buffer. | The cluster ring buffer feature allows to use multiple whole disks in parallel for a single packet ring buffer. | ||
It also allows to optionally write redundant copies of packets to multiple disks to provide fault tolerance in case of a disk failure. | It also allows you to optionally write redundant copies of packets to multiple disks to provide fault tolerance in case of a disk failure. | ||
It is also possible to create multiple cluster packet ring buffers that | It is also possible to create multiple cluster packet ring buffers that | ||
run in parallel. To enable multiple cluster packet ring buffers the | run in parallel. To enable multiple cluster packet ring buffers, the | ||
option `The maximum number of concurrent packet ring buffers` in the | option `The maximum number of concurrent packet ring buffers` in the | ||
capture module options can be set to the required number. | capture module options can be set to the required number. | ||
When clicking the '''Create cluster ring buffer''' button an empty cluster ring buffer will be created and the '''Cluster configuration''' tab on the now visible packet ring buffer statistics page becomes available. | When clicking the '''Create cluster ring buffer''' button, an empty cluster ring buffer will be created and the '''Cluster configuration''' tab on the now visible packet ring buffer statistics page becomes available. | ||
If multiple cluster packet ring buffers are used the page will show | If multiple cluster packet ring buffers are used, the page will show | ||
a number of buttons at the top to switch between the different clusters. | a number of buttons at the top to switch between the different clusters. | ||
Each cluster has | Each cluster has its own statistics and configuration. | ||
In the Cluster configuration tab you can configure the '''Write redundancy level''' at the very top. | In the Cluster configuration tab you can configure the '''Write redundancy level''' at the very top. | ||
This level controls how many redundant copies of each packet are written. | This level controls how many redundant copies of each packet are written. | ||
No replication means that only a single copy of each packet is written and provides no redundancy. | |||
This level gives the highest write bandwidth for a given number of disks | This level gives the highest write bandwidth for a given number of disks; single replication means that one additional copy of each packet is written to some other disk and thus reduces the total write performance for a given number of disks to half the performance of no replication. | ||
Double replication and triple replication write two and three additional copies of each packet respectively. | |||
Note that for each level to work there must be at least the number of replications + 1 disks available in the cluster. | Note that for each level to work there must be at least the number of replications + 1 disks available in the cluster. | ||
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Below the '''Write redundancy level''' setting is the list of all disks available for use in the cluster. | Below the '''Write redundancy level''' setting is the list of all disks available for use in the cluster. | ||
The following columns are displayed in the list: | |||
* Disk: A description of the disk and its capacity. | * Disk: A description of the disk and its capacity. | ||
* Enclosure: If the disk is part of a multi-disk enclosure this column will show the enclosure number along with the slot number. | * Enclosure: If the disk is part of a multi-disk enclosure this column will show the enclosure number along with the slot number. | ||
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In the last | In the last unlabelled column, three buttons are displayed which have the following functionality: | ||
* Add to cluster: Add a fresh disk to the cluster. | * Add to cluster: Add a fresh disk to the cluster. | ||
:The disk will be formatted and added as empty storage to the cluster. All previous data on the disk is lost. | :The disk will be formatted and added as empty storage to the cluster. All previous data on the disk is lost. | ||