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The Message Storage Server high-availability configuration (MSS-H)
uses a Redundant Array of Independent Disks (RAID) storage system
to protect against customer data loss. Three Small Computer System
Interface (SCSI) drives provide RAID level 5 redundancy, which combines
data striping and distributed parity checking. If a SCSI drive fails,
the system automatically rebuilds the data after a new SCSI drive
is installed.
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Note: If all the disk drives in a system are damaged
(for example, due to a lightning strike), then you need to
replace the entire unit. See Replacing
the entire machine for this procedure.
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Replacing a SCSI RAID drive
The MSS-H allows disks to be removed and replaced in a SCSI RAID
disk-drive assembly while the system continues to provide service.
All SCSI drives are considered "hot swappable" and can
be replaced while the system is in service.
To replace a SCSI RAID drive in an MSS high-availability configuration:
- Verify that the replacement equipment is on site and appears
to be in usable condition, with no obvious shipping damage.
- Remove the faulty drive.
- Install the new drive and verify operation.
Remove the faulty drive
To remove a faulty SCSI RAID drive:
- Remove the bezel (plastic cover) on the front of the chassis.
See Removing or replacing the front bezel.
- Press down on the two tabs on the top of the bezel.
- Rock the bezel forward, then lift it out.
- Locate the drive to replace as follows:
- Drive 0 (d0b0t0d0): the top drive, closest to the DVD-RAM
drive.
- Drive 1 (d0b0t1d0): the middle drive.
- Drive 2 (d0b0t2d0): the bottom drive.
- Loosen the retaining screw on the handle (latch) for the faulty
SCSI RAID drive.
- Open the latch to unseat the old disk drive, then pull it by
the handle from the drive cage. See Removing
or replacing a SCSI RAID drive.
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Caution!
Wait at least 1 minute after removing the old SCSI drive before
installing the new one. This gives the system time to sense
the installation of the new drive.
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Install the new drive and verify operation
To install a new SCSI RAID drive and verify that full service is
being restored:
- Position the replacement drive in the correct orientation in
the chassis.
- Gently slide the drive into the machine, then close the latch
to seat it firmly in place. See Removing
or replacing a SCSI RAID drive.
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Note: The LED for the new drive (HDD-0, -1, or -2)
lights, indicating that the system has recognized the new
drive and has begun to reconstruct the data from the other
two drives. It takes at least 1 minute before the rebuild
starts and status information appears. The console then
displays a "rebuild started" message.
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- Tighten the retaining screw.
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Note: For safety reasons, tighten the retaining
screw with a screwdriver until it cannot be loosened by
hand.
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- Replace the bezel (plastic cover) on the front of the chassis.
See Removing or replacing the front bezel.
- Insert the bottom of the bezel into the chassis.
- Push the bezel upright until the two upper tabs snap into
place under the top cover.
- Verify that the disk rebuild procedure is underway. See Retrieving
hard disk drive information.
The entire rebuild procedure can take up to 10 hours.
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