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Disks

LibraCyber Email Archiver allows to view the details of the disk attached to the virtual machine. For each disk the following information are shown:

  • disk name: the label the Archiver assigns to the disk
  • size: the total size of the disk
  • available: the available space on the disk
  • used: the used space on the disk
  • percentage: the percentage of used space on the disk
  • SCSI controller: the SCSI controller number of the disk
  • SCSI identifier: the SCSI identifier of the disk

From this view you can understand the logical mapping between the labels the Archiver assigns to the disks and the SCSI information. This mapping is useful when you have to expand a disk.

How the Archiver uses disks

The Archiver uses the disks for different purpose:

  • System: it contains the root of the file system; DEFAULT size= 16GB; it never needs expansions
  • Engine: it is used for all the Archiver operations; the usage should always be below 80%
  • Index: it is dedicated to store the files used by the indexing engine; the usage should always be below 80%
  • Disk1 and other disks: they can be used for creating volumes (data, folder, structure, import, export, ...) and they can be used as execution disks for jobs like import, export, reindex, ...

How the Archiver alert for disks usage

The Archiver checks the usage of the disks and triggers notifications in these cases:

  • System:
    • Triggers warning if usage is above 90% and stops all the import/export processes
  • Engine:
    • Triggers warning if free space is below 10GB and suggest to expand the disk. (Color shifts to yellow in on-premise version)
    • Triggers warning if free space is below 4GB and stops all the import/export processes. (Color shift to red in on-premise version)
  • Index:
    • Triggers warning if free space is smaller than the biggest chunk and stops all the import/export processes. (Color shift to red in on-premise version)
    • Triggers warning if free space is smaller than two times the size of the biggest chunk. (Color shifts to yellow in on-premise version)
    • Triggers warning if free space is below 1GB and stops all the import/export processes. (Color shift to red in on-premise version)
  • Disk1, Disk2, DiskN:
    • Triggers warning if free space is below 10GB and suggest to expand the disk. (Color shifts to yellow in on-premise version)
    • Triggers warning if free space is below 5GB and suggest to expand the disk. (Color shift to red in on-premise version)

Chunk indexing is explained here. To run optimally, the Email Archiver indexing system needs to have enough space to run optimization daily and needs to have a precise number of chunks to run properly.

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