Grass Valley K2 System Guide v.9.0 - Manual (Page 125)

storage or shared SAN storage do not contain a disk controller board, as RAID disks are in the
external RAID storage devices.
RAID 1 — Drives configured as RAID 1 provide redundancy. The two disks in a RAID 1 LUN are
redundant partners. Any single disk in a LUN can fail and disk access can continue. When a disk
fails, error messages in the AppCenter StatusPane inform you of the problem. You can then replace
the failed disk. The data is rebuilt on the replacement disk and redundancy is restored.
RAID 0 — Media drives configured as RAID 0 offer no redundancy. If any single RAID 0 media
drive fails, all data is lost on all media drives.
K2 Solo Media Server internal storage system
The storage system on a K2 Solo Media Server includes the following:
Compact Flash — The Compact Flash boot media serves as the system drive. The Windows operating
system, applications, and other standard computer software components reside on the system drive.
RAID drives — A K2 Solo Media Server contains 2 disk modules. Media data is written or “striped”
across media drives in a continuous fashion, which makes them a “stripe group”. This media stripe
group appears as the V: drive to the Windows operating system. Disks are configured as RAID 0,
so you cannot remove and replace a disk module while the K2 Solo Media Server is operational. If
a disk fails, you lose all media.
Disk controller board — The disk controller board provides the RAID functionality for the internal
disks.
RAID 0 — Media drives configured as RAID 0 offer no redundancy. If any single RAID 0 media
drive fails, all data is lost on all media drives.
About the direct-connect storage system
A K2 Summit system that is directly connected to an external K2 RAID storage device for media
storage is a self-contained, stand-alone unit.
The storage system on direct-connect storage K2 Summit system includes the following:
System Drive — Compact Flash (first generation Summit) or mSATA (Summit 3G) boot media
serves as the system drive. The Windows operating system, applications, and other standard computer
software components reside on the system drive.
Fibre Channel card — The direct-connect K2 Summit system has a direct Fibre Channel connection
to external K2 RAID. The K2 Summit system must have the optional Fibre Channel card installed
to support this connection.
There are no internal RAID drives or a disk controller board in a direct-connect storage K2 Summit
system.
RAID 5 — Drives configured as RAID 5 provide redundancy. There are six disks in one RAID 5
LUN. A disk in a LUN can fail and disk access can continue. When a disk fails, error messages in
the AppCenter StatusPane inform you of the problem. You can then replace the failed disk. The
data is rebuilt on the replacement disk and redundancy is restored.
06 November 2012 K2 System Guide 125
Managing Stand-alone Storage