Grass Valley K2 Storage System Instruction Manual v.3.2 Aug.01 2007 - Manual (Page 355)

July 3, 2007 K2 Storage System Instruction Manual 355
Expanding the media file system by bandwidth
Expanding the media file system by bandwidth
If you want to retain your media file system and yet expand the bandwidth of your K2
Storage System, you must use the following procedures for dynamic bandwidth
expansion. This process allows you to add LUNs to the stripe group, thereby
expanding its width, without reinitializing the file system. This keeps the existing
media intact. The additional LUNs can be made up of new disks in existing RAID
chassis, disks in new Expansion Chassis, or disks in new primary RAID chassis.
After the file system is expanded, existing media is still striped across the original
narrower stripe group, so it can not take advantage of the increased bandwidth. Also,
if there is a significant portion of the storage pool occupied by this existing media, its
presence reduces the extent to which new media can use the increased bandwidth. For
this reason the dynamic bandwidth expansion process provides the Restripe Utility,
which restripes the existing media across the new wider stripe group. This enables
both the existing media and new media to get full benefit of the increased bandwidth.
Refer to
“Managing the Restripe Utility” on page 358 for more information.
If the media on your file system has a high turnover rate and you know existing media
is to be deleted right away, you have the option of disabling the Restripe Utility. This
saves the system resources and time required to restripe media.
Dynamic bandwidth expansion is supported only with K2 system software version 3.2
and higher.
NOTE: Adding RAID storage devices changes your system design and must be
specified for your K2 Storage System by Grass Valley. Do not attempt to add RAID
storage devices without support from Grass Valley.