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* - Can support up to 64 devices, but only 16 can be used in a RAID
configuration.
** - Assumes one Storage Enclosure Processor (SEP) per enclosure.
The maximum numbers in Tabl e 1.1 depend on how many physical
devices you have connected to the RAID controller. For example, the
maximum number of drive groups is equal to the number of drives
supported by the controller. Thus, for the SAS 9240-4i RAID controller,
the maximum number of drive groups per controller is eight, which is
based on the maximum number of physical devices that can be
connected. In addition, the maximum number of hot spares per controller
is equal to the maximum number of drives per controller.
Although you can have up to 16 virtual drives per drive group and up to
16 drive groups per controller (depending on the controller), there is a
limit of 64 virtual drives per controller.
These RAID controllers support 64-bit logical block addressing (LBA),
which makes it possible to connect a large number of drives to the RAID
controller, directly and through expanders. However, the actual number
of drives that you can attach depends on the limits listed in Tabl e 1. 1
rather than by actual RAID volume capacity.
Maximum drives per
controller
16* 16* 32 32 32 240 240
Maximum hot spares
per controller
8 8 32 32 32 240 240
Maximum spans per
virtual drive
8888888
Maximum enclosures
per port**
222221010
Number of ports 1212222
Table 1.1 SAS RAID Controller Array Limitations
Specification
SAS 9240-4i
SAS 9240-8i
SAS 9260-4i
SAS 9260-8i
SAS 9261-8i
SAS 9280 4i/4e
SAS 9280-8e