Creating a Hot Spare
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Creating a Hot Spare
You can designate an available drive as a hot spare
.
If a redundant unit
degrades and a hot spare the size of the degraded disk (or larger) is available,
the hot spare will automatically replace the failed drive in the unit without
user intervention. When this occurs, an event notification is generated and
appears in the list of alarms in 3DM.
It’s a good idea to create a hot spare after you create a redundant unit.
In order to replace a failed drive, a hot spare must have the same or larger
storage capacity than the drives it is replacing.
For 9550SX controllers, the Auto-Rebuild policy allows automatic rebuilding
to occur with drives that are not designated as spares. For more information,
see “Setting the Auto-Rebuild Policy” on page 123.
Note:
3ware’s 9000 series RAID controllers use drive coercion so
that drives from differing manufacturers and with slightly different
capacities are more likely to be able to be used as spares for each
other. Drive coercion slightly decreases the usable capacity of a
drive that is used in redundant units.
The capacity used for each drive is rounded down to the nearest
GB for drives under 45 GB (45,000,000,000), and rounded down to
the nearest 5 GBytes for drives over 45 GB. For example, a 44.3
GB drive will be rounded down to 44 GBytes, and a 123 GB drives
will be rounded down to 120 GBytes.
If you have 120 GB drives from different manufacturers, chances
are that the capacity varies slightly. For example, one drive might
be 122 GB, and the other 123 GB, even though both are sold and
marketed as “120 GB drives”. 3ware drive coercion uses the same
capacity for both of these drives so that one could replace the other.
Specifying a Hot Spare through 3DM
If you need to add a drive to be used as the hot spare, follow the instructions
under “Adding a Drive through 3DM” on page 160.
To specify a hot spare after the system is booted
1
In the
Available Drives
section of the Maintenance Page, select the drive
by checking the box next to it.
2
Click
Create Unit
.
3
In the dialog box that appears, select the configuration type
Spare
.
4
Click
Ok
.
You will see the spare appear at the top of the page, under
Unit
Maintenance
.
Summary of Contents for 9550SXU-16ML - Sata Rohs
Page 10: ...viii 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 64: ...Chapter 4 Driver Installation 54 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 74: ...Chapter 5 3ware BIOS Manager 2 3BM 2 64 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 124: ...Chapter 6 3ware Disk Manager 3DM 2 114 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 220: ...Chapter 10 Maintaining Your Controller 210 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 246: ...Appendix A Glossary 236 3ware 9550SX Serial ATA RAID Controller User Guide...
Page 260: ...250 3ware 9550SX Serial ATA RAID Controller User Guide...
