E1024/E1012 drive enclosure rear panel components
S3200/S2200 controller enclosures support SFF E1024 24-disk and LFF E1012 12-disk drive enclosures in
the 2U form factor for expansion of storage capacity. These drive enclosures use mini-SAS (SFF-8088)
connectors to facilitate backend SAS expansion. The rear panel view is common to both drive enclosures.
Cable requirements for storage enclosures
1 Power supplies (AC shown)
2 Expansion module A
3 Expansion module B
4 Disabled button (used by engineering/test only)
Connecting the controller enclosure and drive enclosures
Component installation and replacement
Installation and replacement of S3200/S2200 CRUs (customer-replaceable units) is addressed in the
Lenovo Storage CRU Installation and Replacement Guide within the "Procedures" chapter.
CRU procedures facilitate replacement of a damaged chassis or chassis component:
• Replacing a controller or expansion module
• Replacing a disk drive module
• Replacing a Fibre Channel transceiver
• Replacing a 10GbE SFP+ transceiver
• Replacing a 1 Gb SFP transceiver
• Replacing a controller enclosure chassis
For additional information, contact support.lenovo.com, select Product Support, and navigate to Storage
To enable faster data access from disk storage, the following types of caching are performed:
• Write-back or write-through caching. The controller writes user data into the cache memory in the
controller module rather than directly to the disks. Later, when the storage system is either idle or aging
—and continuing to receive new I/O data—the controller writes the data to the disks.
• Read-ahead caching. The controller detects sequential data access, reads ahead into the next
sequence of data—based upon settings—and stores the data in the read-ahead cache. Then, if the
next read access is for cached data, the controller immediately loads the data into the system memory,
avoiding the latency of a disk access.
TIP: See the Storage Management Guide for more information about cache options and settings.
Figure 10 Drive enclosure rear panel view (2U form factor)
on page 23 for cabling information.
5 Service port (used by service personnel only)
6 SAS In port
7 SAS Out port
Lenovo Storage S3200/S2200 Setup Guide
on page 22 for more information.