Grass Valley PRS 250 RAID Storage System - Manual (Page 64)

Chapter 3 Servicing the System
3-18 RAID Instructions
Replacing or Adding a Disk Module
If you are replacing a failed module, start below with Removing a Disk Module. If
you are adding an optional group, skip to Installing a DiskModule.
Removing a Disk Module
You can replace a failed disk module while the storage chassis is powered up. If
necessary, you can also replace a disk module that has not failed, such as a module
that has reported many “soft” errors. When replacing a module that has not failed, you
must replace the module while the storage chassis is powered up so that the SP knows
the module is being replaced.
RAID storage will support full Profile Video Disk Recorder operation with up to one
disk failure per LUN (Logical Unit Number, a grouping of 5 disks). If more than one
disk failure occurs in a single RAID unit (but in different LUNs), you must
completely repair one of the failures before starting the repair of the next failure.
Repairing two failures at the same time will adversely affect RAID performance.
NOTE: Never remove a disk module until you are ready to install a replacement. If
you must remove the failed module when a replacement is not available, install a
disk filler module in the empty slot to maintain proper cooling (see “Removing or
Installing a Disk Filler Module”).
CAUTION: Disk modules are extremely sensitive to shock and vibration. Do not
drop or set down hard. Do not store or transport unpackaged modules. A defective
module must be returned to Tektronix in its original shipping container.
Before replacing a disk module, verify that the suspected module has actually failed.
If you remove the wrong disk module, you introduce an additional fault that shuts
down the physical disk containing the failed module. In this situation, the operating
system software cannot access the physical disk until you initialize it again.
To remove a disk module:
1. Read Avoiding Electrostatic Discharge (ESD) Damage.
2. Attach the clip of the ESD wrist band (strap) to a grounded chassis, and put the
wrist band around your wrist with the metal button against your skin.
3. Locate the disk module that you want to remove, and remove it as shown below.