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Ring Buffer Configuration Guide: Difference between revisions
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Ring Buffer Configuration Guide (view source)
Revision as of 08:57, 11 September 2023
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[[File:Cluster ring buffer configuration.png|border|600px]] | [[File:Cluster ring buffer configuration.png|border|600px]] | ||
Please select here '''Add to | Please select here '''Add to Packet Ring Buffer''' to format a disk and add it to the Packet Ring Buffer. Once you have added disks to a Packet Ring Buffer, the packets will be written to the storage device. | ||
[[File:Cluster ring buffer with disks.png|border|600px]] | [[File:Cluster ring buffer with disks.png|border|600px]] | ||
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=== Disk read and write performance === | === Disk read and write performance === | ||
Hard disk drives have a high constant write rate when only one write is active. | |||
The Allegro Network Multimeter has a ''write first'' policy on the ring buffer devices. The Allegro Network Multimeter prioritizes writes over reads for storage. A pcap read can be very slow when there is a high write rate to the ring buffer. | The Allegro Network Multimeter has a ''write first'' policy on the ring buffer devices. The Allegro Network Multimeter prioritizes writes over reads for storage. A pcap read can be very slow when there is a high write rate to the ring buffer. | ||
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=== Concurrent '''ring buffer''' and live '''pcap''' recording === | === Concurrent '''ring buffer''' and live '''pcap''' recording === | ||
Note that HDDs are not made for 2 simultaneous write streams. The write rate will be very low if you capture a live pcap to the single shared storage device while having an active ring buffer. Please use the browser download feature, different disks with the | Note that HDDs are not made for 2 simultaneous write streams. The write rate will be very low if you capture a live pcap to the single shared storage device while having an active ring buffer. Please use the browser download feature, different disks with the Packet Ring Buffer or pause the ring buffer while capturing the live pcap. | ||
=== Buffering traffic peaks or disk slowdowns === | === Buffering traffic peaks or disk slowdowns === | ||
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The Allegro Network Multimeter does ''not'' store the password of the encrypted device on the disk. you need to re-enter the password if you unmount, reboot or power-off the Allegro Network Multimeter. | The Allegro Network Multimeter does ''not'' store the password of the encrypted device on the disk. you need to re-enter the password if you unmount, reboot or power-off the Allegro Network Multimeter. | ||
The encryption is not available | The encryption is not available when entire disks are used in the Packet Ring Buffer. | ||
==== Random, device specific passwords ==== | ==== Random, device specific passwords ==== | ||