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Adaptec AAR-2420SA Read Me page 6

Raid controller
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controller firmware/BIOS, as the BIOS may have been reset to
its default settings during the upgrade.
4.18 RAID 10/50/60 array leg limitations
A RAID 10, RAID 50, or RAID 60 array cannot have more than 32
legs when created using the Build method. Maximum disk drive
count is only limited by RAID level. For instance, a RAID 10
array built with 32 RAID 1 legs (64 disk drives) is supported;
a RAID 5 array built with 32 RAID 5 legs (96 disk drives) is
also supported. Although you can create a RAID 10 array with
more than 64 drives using the Quick Init method, the maximum
number of build/verify operations that can happen at any one
time is 32; therefore, such an array could not be verified.
4.19 Microsoft VDS Storage Manager LUN Error
On some systems when creating a new LUN, the Microsoft VDS
Storage Manager for SANs snap-in may not work properly and
crash with an MMC snap-in error.
4.20 ASR-4805SAS controller
On Intel 945X or 955X motherboards with Mode0 set, the controller
is not recognized when installed in the primary 16x PCIe slot.
4.21 UnixWare and OpenServer
Adding or moving controllers in an existing UnixWare or OpenServer
system may cause some device resources to change, which may lead
to the operating system being unable to boot.
is no workaround available in the operating system. Before
installing the operating system, make sure all PCI devices are
either enabled or installed.
The individual behavior and affected devices will vary from system
to system.
may handle their PCI bus layouts, and how those layouts could be
changed when installing or rearranging devices.
changes and affects a critical system device (video, boot controller,
etc.) then the operating system may be unable to recover from that
change and be non-bootable.
4.22 ASR-31205/ASR-31605 with Sony SDX-470V tape drive
Backing up large files (800KB or larger) to a Sony SDX-470V
tape drive will generate an input/output error.
4.23 SATA disks do not support Dual Path with Expanders
Connect Dual Path SAS Enclosures with 2 Expanders only via one
Expander when using SATA disks, SATA disks do not support
Dual Path. If SATA disks are connected using 2 Expanders the
controller BIOS may crash.
4.24 DOS OS not supported
This is due to the different ways in which motherboards
Currently, there
If the bus layout

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