After you Perform
Initial Configuration of the M-Series Appliance, you can
increase log storage capacity of the appliance by upgrading the
existing drive pairs to larger capacity drives or by installing
additional drive pairs in empty drive bays. For example, you can
choose to upgrade the existing 1TB drives to 2TB on an M-500 appliance,
or you can add 2TB drives to the empty drive bays (B1 through D2).
The M-Series appliances leverage RAID 1 for
data redundancy in the event of disk failure. Therefore, the pair
of drives in a RAID 1 array need to be identical. However, you are
free to mix drive capacities across different RAID 1 arrays. For example,
the drives in the A1/A2 RAID 1 array can be 1TB drives, and the
drives in the B1/B2 RAID 1 array can be 2TB drives.
The following table lists the maximum number of drive bays (disks)
and the available drive capacities supported on M-Series appliances.
Because each drive pair (A1/A2 for example) is in a RAID
1 array, the total storage capacity is half of the total drives
installed. For example, if an M-500 appliance has 2TB drives installed
in drive bays A1/A2 and B1/B2, the A1/A2 array provides 2TB total
storage and the B1/B2 array provides another 2TB for a total of 4TB.
You don’t need to take the M-Series appliance offline to
expand the storage when adding drives to an M-Series appliance that
is already deployed. When the additional drives are configurable
and available, the M-Series appliance redistributes the logs among
all available drives. This log redistribution process happens in
the background and does not impact uptime or the availability of
the M-Series appliance. However, the process does diminish the maximum
logging rate. The Redistribution State column (
the completion status of the process as a percentage.