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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.