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007-5653-001
1: Introduction and System Components Overview
PCI Subsystem
The primary I/O buses for the server board is PCI Express.
Disk RAID Support
The ISS3500 supports both software and hardware RAID. Two SATA RAID HBAs are added to
the configuration to support a maximum of 38 disk drives with RAID (2 internal and 36 external).
RAID is defined as an array of multiple independent hard disk drives that provides high
performance and fault tolerance. Disk performance is improved because more than one disk can
be accessed simultaneously. Fault tolerance is improved because data loss caused by a hard drive
failure can be recovered by rebuilding missing data from the remaining data or parity drives.
The ISS3500 supports the following RAID levels:
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RAID 0 (Striping)
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RAID 1 (Mirrored)
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RAID 5 (Parity)
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RAID 6 (Dual Parity)
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RAID 10 (Mirrored Stripes)
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RAID 50 (Striping with Parity)
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RAID 60 (Striping with Dual Parity)
In the standard RAID configuration (ISS-BASE-3500), the SAS3041e-IR HBA is installed in the
chassis. This HBA supports RAID 0, 1, 1E, and JBOD and is used for the internal boot drives.
The second SATA RAID HBA is a MegaRAID 9261-8i and is used with the 36 external drives.
This HBA supports all of the RAID levels in the standard configuration with the addition of RAID
5 and RAID 6.
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