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Packet ring buffer: Difference between revisions
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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 to optionally write redundant copies of packets to multiple disks to provide fault tolerance in case of a disk failure. | ||
When clicking the | 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. | ||
In the | In the Cluster configuration tab you can configure the '''Write redundancy level''' at the very top. | ||
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. | 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. 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 disk to half the performance of no replication. | 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 disk to half the performance of no replication. | ||
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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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|[[File:Cluster3.png|600px|thumb|right]] | |||
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Below the | Below the '''Write redundancy level''' setting is the list of all disks available for use in the cluster. | ||
Following columns are displayed in the list: | 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. | ||
* Status: If the disk has been added to the cluster this column will display the current status as | * Status: If the disk has been added to the cluster this column will display the current status as '''ok''' or '''failed'''. | ||
* Locator: For disks in a multi-disk enclosure the button displayed in this column allows to turn the slot locator LED on and off. | * Locator: For disks in a multi-disk enclosure the button displayed in this column allows to turn the slot locator LED on and off. | ||
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If a disk is missing because it was e.g. removed from the enclosure it will be displayed in a separate list with much of the information as in the list described above but only one button with the option to remove it from the cluster packet ring buffer. | If a disk is missing because it was e.g. removed from the enclosure it will be displayed in a separate list with much of the information as in the list described above but only one button with the option to remove it from the cluster packet ring buffer. | ||
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[[File:Cluster4.png|1200px|thumb|right]] | |||
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==== Packet ring buffer snapshot length filter ==== | ==== Packet ring buffer snapshot length filter ==== | ||