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Dell PowerVault MD3000i User Manual

Page 10

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10

About Your System

Two redundant, hot-pluggable power supply/fan modules

512 MB of mirrored cache on each RAID controller module

Battery backup unit in each RAID controller module that protects against
cache data loss for up to 72 hours

Support for up to 45 3.5" SAS physical disks

Support for up to 255 virtual disks per disk group

Up to 2 TB (2036 GB) storage on a single virtual disk

Support for up to two PowerVault MD1000 expansion enclosures through
SAS Out port connectors on the RAID controller modules

Online firmware updates (without taking the enclosure offline) for the
following components:

RAID controller modules

NVSRAM

Physical disk

NOTE:

Dell recommends stopping all I/O to the array when downloading

physical disk firmware.

Expansion enclosure management modules (EMMs)

Task-based configuration software (MD Storage Manager)

Optional snapshot virtual disk (premium feature), up to four snapshots per
virtual disk and 128 snapshots per array

Optional virtual disk copy (premium feature), up to 255 virtual disk copies
per array

Continuous background event monitoring for critical problems, such as
impending physical disk failure or failed RAID controller modules

Host-based, multipath failover software for redundant configurations to
automatically reroute I/O activity from a failed, offline, or removed RAID
controller module to its alternate RAID controller module (or from a failed
iSCSI connection). This capability maintains a data path between the host
server and the storage array.