Supports dual-active, hot-swappable controllers for high availability. Cache: 1 GB of cache per controller, upgradable to 2 GB .
Can be expanded to support up to 192 disk drives by attaching EXP3512 or EXP3524 expansion units . ibm ds3512 manual
For (most common):
Yes, but the manual requires SAS interposers for SATA drives when dual-controller failover is needed. Without interposers, SATA drives are single-controller only. ibm ds3512 manual
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