Disk Shelf Hardware Overview
optimized cache and write-optimized log operations. This disk shelf features dual, redundant I/
O Modules (IOMs), and dual power supplies with integrated fan modules.
External Read Cache Devices - Read cache devices, installed in disk shelves, are external to
the controller and referred to as external second level adaptive replacement cache (EL2ARC).
When a cluster takeover occurs, read cache remains persistent and sharable between controllers,
enabling read performance to be sustained.
For slot configuration details and minimum software requirements, see “Disk Shelf
Configurations” on page 286.
FIGURE 66
Sun Disk Shelf 24x3.5" SAS-2
The Sun Disk Shelf is a 4U chassis that supports 24 3.5" SAS-2 drives. The SSDs provide
write-optimized operations, and the high-capacity HDDs provide reliable data storage. This disk
shelf features dual, redundant SAS Interface Module (SIM) boards, and dual power supply with
fan modules.
Disk Shelf Back Panel Components - The back panel consists of the power supplies, fans, I/O
Modules (IOMs) or SAS Interface Modules (SIMs), and indicator lights.
274 Oracle ZFS Storage Appliance Customer Service Manual • July 2016
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