Scalability
• With direct-attached storage, more storage
means more servers
• Cost of server hardware, software, installation,
and maintenance can triple the cost of new
storage
• Increased implementation time decreases
business agility
With direct-attached storage, each disk is attached to a server:
Adding more direct-attached storage means adding more servers, due
to:
The limited number of devices that can be managed by a server’s
SCSI bus
The server’s total processing capacity
Adding more servers can triple the cost of new storage:
Server hardware
Server OS and application software licenses
Deployment time
Operational and maintenance costs
More servers mean more single points of failure, increasing the risk of
downtime.