3PAR InForm® OS 2.3.1 Concepts Guide (320-200112 Rev B, February 2010)

13.6
Drive Cage Models
3PAR InForm OS Concepts Guide InForm OS Version 2.3.1
13.3.1 Disk Replacement
When a physical disk failure occurs, the disk is no longer usable by the InServ system and must
be replaced. As a physical disk fails, the InServ system automatically relocates the chunklets in
this disk to other disks in the system. When replacing the physical disk, the chunklets from all
of the disks in the drive magazine must be managed during the replacement procedure.
Managing the disk replacement procedure includes:
■ Completely relocating the chunklets during the disk replacement procedure.
■ Relocating the chunklets from the failed disk, and then temporarily diverting data writes to
chunklets from the valid disks to logging logical disks.
Refer to the 3PAR InForm OS CLI Administrator’s Manual for instructions on how to perform
these tasks.
13.4 Drive Cage Models
There are three models of drive cages: DC2, DC3, and DC4. The InServ S-Class Storage Servers
and T-Class Storage Servers may contain both DC2 and DC4 drive cages. The InServ E-Class
Storage Servers and F-Class Storage Servers only contain DC3 drive cages.
■ The DC2 drive cage is a 40 disk, 2 Gbps drive cage.
■ The DC3 drive cage is a 16 disk, 2 Gbps or 4 Gbps drive cage.
◆ F-Class DC3: up to 4 Gbps
◆ E-Class DC3: up to 2 Gbps
■ The DC4 drive cage is a 40 disk, 4 Gbps drive cage.
13.4.1 DC2 and DC4 Drive Cages
The DC2 and DC4 drive cages house ten drive bays numbered 0 through 9. Each drive bay
accommodates a single drive magazine that holds four disks. Figure 13-5 and Figure 13-6 show
a DC2 and DC4 drive cage.