Tandem Volumes:
In Tandem mode, both drive groups in a 24D are used for primary data, as well as
parity (RAID5) data. Only RAID5 DynaRAID protection is available when creating a
volume in Tandem mode between two groups on the same server. Tandem volumes
created on a single server are also referred to as ‘Internal Tandem’ volumes as they
are self contained on a single server. Facilis recommends creating all volumes
Tandem for optimal performance.
RAID50 / RAID51
RAID50 and RAID51 volumes are created across multiple Facilis devices (TerraBlock
Servers or TX16 Expansion Chassis’) and are referred to as Multi-Server or ‘External
Tandem’ volumes. In a RAID50 external tandem volume, the RAID5 data is spread
across multiple Facilis devices. In a RAID51 external tandem volume, the RAID5 data
is mirrored across multiple Facilis devices. For use with Multi-user Write volumes the
two or more servers must be attached via fibre channel.
External Tandem Volumes:
External Tandem (RAID50, RAID51,) volumes appear under a single heading in the
TerraBlock Manager ‘Volumes’ Tab for mount, un-mount and administration
purposes. External Tandem volumes are displayed with an arrow icon next to the
Volume Name in order to indicate that the volume is an External Tandem.
The individual server pieces that are used to comprise the combined
External Tandem volume may be viewed by double-clicking on the volume
name. Individual server pieces will appear with a ‘~’ symbol next to the
volume name with a number indicating the number of the individual piece
(~1, ~2, etc).
RAID50: RAID50 volumes are created on the TerraBlock Server and are intended for
use as Multi-user Write volumes. If the RAID50 volume has not yet been set to Multi-
user Write, this can be done using the ‘Change Volume’ feature in the TerraBlock
Manager. Changing RAID50 volumes to Multi-user Write can only be done from the
TerraBlock Manager running on the TerraBlock Server.
Changing a volume from Single-user to Multi-user Write does not require the volume
to be un-mounted on the TerraBlock Server.
When working with RAID50 volumes, verify they are set to Multi-user Write prior to
mounting on a client workstation.
RAID51: RAID51 volumes are created on the TerraBlock Server and are intended for
use as Multi-user Write volumes. If the RAID51 volume has not yet been set to Multi-
user Write, this can be done using the ‘Change Volume’ feature in the TerraBlock
Manager. Changing RAID51 volumes to Multi-user Write can only be done from the
TerraBlock Manager running on the TerraBlock Server.
Changing a volume from Single-user to Multi-user Write does not require the volume
to be un-mounted on the TerraBlock Server.
When working with RAID51 volumes, verify they are set to Multi-user Write prior to
mounting on a client workstation.
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