Storage Configurations
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Clients should not access workspaces that are in the process of being moved when it is a 256 KB
chunk size workspace being moved into a Storage Group with a 512 KB chunk size. Avid
recommends that clients unmount these workspaces until the move is complete to avoid an
unintentional access. Once the move begins, it cannot be cancelled.
Mirrored Storage Groups, Single ISB Failure
It is considered an “unprotected state” if you have a single ISB failure in a mirrored Storage
Group. In an unprotected state with no additional failures, read operations continue to function
normally.
However, in an unprotected state a subsequent or infrastructure failure will cause operational
issues which could result in failures when writing new data or prevent you from accessing data in
the Storage Group. An additional ISB failure creates a situation in which data accessibility has
been compromised. Networking issues, on the other hand, will not cause accessibility issues on
previously written data but might prevent the successful completion of the active write operation.
This issue only applies when the Storage Group is in an unprotected state and the remove
redistribution process on the failed ISBs has not been initiated. Therefore, it is highly
recommended that the remove redistribution process is initiated immediately upon confirmation
of any ISB failure. This ensures immediate protection (RAID or mirroring) of new data being
written, and full protection of all stored data at the earliest possible time.
RAID-6 Storage Groups
Avid ISIS supports a two types of data protection. Besides mirrored Storage Groups, you can
create redundant array of independent disks (RAID) Storage Groups. RAID storage offers more
value in that it provides more storage at a lower cost per GB. Using the Avid Interplay
Copy/Move service, data files can be moved from mirrored Storage Groups to and from RAID
Storage Groups. The following are two obvious advantages to using RAID Storage Groups:
•
Migration from mirrored to RAID workspaces can become part of your normal workflow.
You can move the data that is no longer used in the mirrored workspaces to RAID
workspaces for longer term storage. This frees up faster storage elements (mirrored) for
higher performance work.
•
RAID Storage Groups allow you to work on a lower resolution workflow at less cost.
•
RAID Storage Groups increases available GB per physical engine from 50% in mirrored to
75% in RAID of installed capacity.