More on RAM disk here.

Starting RAM disk

If ramdisk is disconnected due to server outage or unexpected situation, you can start it by running the following script from ISPadmin console:

/usr/local/script/ispadmin/rrd_ramdisk.pl start force

This way you will start ramdisk and restore data from the last backup. Use [force] option to restore the data even if it is smaller than the last known data.

Restoring RRD data from backup

ISPadmin creates backups of graphs stored in ramdisk automatically once a day. 10 backups are created back.

If the data is corrupted and ISPadmin detects it (change in data size by more than 5% compared to the previous size, or disconnected disk), you can restore data to ramdisk, if initiated, or to the original directory with rrd data:

/usr/local/script/ispadmin/rrd_ramdisk.pl restore -- restores data from last backup

If the recovery of the ramdisk data does not fix your problem, try having a look at the list of backups and choosing the largest one. Such a backup is the most likely to contain all graphs.

If you add the name of the backup to be restored behind restore (skip the leading directory, e.g. rrd_backup_2016_05_26_13_40_03.tgz), the system will restore this backup.

If you need to restore data from system backups, section script, follow instructions in restore data from scripts backups to directory, copy this backup into a directory with backups for rrd ( /usr/local/script/ispadmin/rrd_data_backup/), and then follow instructions in this paragraph.

Increasing RAM disk manually

RAM disk is maintained until 80% of its capacity. If this capacity is reached, the system will try to increase RAM disk size by 20%.
You can define RAM disk size by running the following command:

/usr/local/script/ispadmin/rrd_ramdisk.pl set size_in_MB - Set size RamDisk to