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Chapter 1 DXi3500 and DXi5500 System Description
Hard Drive Storage
Quantum DXi3500 and DXi5500 User’s Guide
13
RAID Sets
1
The DXi3500/DXi5500 system is divided into RAID sets. The number of
RAID sets differs depending on the system:
• DXi3500 can contain two RAID sets:
• The first RAID set is made up of either the first four drive sleds
(drive sleds 1-4) in a four drive system or eight drive sleds (drive
sleds 1-8) in an eight drive system.
• If the original system was upgraded from four to eight drives, the
second RAID set is made up of the last four drive sleds (drive
sleds 5-8).
• DXi5500 can contain four RAID sets:
• The first RAID set is made up of the first six drive sleds (drive
sleds 1-6).
• The second RAID set is made up of the next five drive sleds
(drive sleds 7-11 with drive 12 as a hot spare).
If the DXi5500 is fully populated with twenty-four hard drives:
• The third RAID set is made up of the next six drive sleds (drive
sleds 13-18 if installed).
• The fourth RAID set is made up of the next five drive sleds (drive
sleds 19-23 with drive 24 as a hot spare).
Hard Drive Failures
1
• In a DXi3500, each RAID set can sustain a single hard drive failure.
• In a fully populated DXi5500, there are two hot spares. The first hot
spare protects the first and second RAID sets and the second hot
spare protects the third and fourth RAID sets. If a hard drive failure
occurs, one of the two designated hot spares is used to rebuild the
RAID set. Once the RAID set is rebuild, the DXi5500 can sustain
another single hard drive failure.
Virtual Tape Cartridges
1
The DXi3500 can contain 1600 virtual cartridges and the DXi5500 can
contain 3200 virtual cartridges.