Specifications

DS300f G2 Series User Manual
211
raId Controller probleMs
RAID controller problems include:
• "Maintenance Mode" on page 211
• "Finding and Correcting the Cause of the Problem" on page 211
• "Taking a RAID Controller out of Maintenance Mode" on page 211
• "Unsaved Data in the Controller Cache" on page 212
Controllerproblemsoccurwhenoneofthecontrollersgoesintomaintenancemode.
maIntenance moDe
ForASUSDS300fG2swithtwoRAIDcontrollers,oneofthementersmaintenance mode in the event of:
• A difference of some kind between the two controllers (described below)
• An internal controller failure
Whenacontrollerentersmaintenancemode,itgoesofineanditdisplaysN/A (not accessible) under Readiness
Status.
Youmustndandcorrectthecauseoftheproblemandthentakethecontrolleroutofmaintenancemode.
fInDInG anD correctInG the cauSe of the Problem
externAl checks
MakethefollowingexternalcheckstoyourASUSDS300fG2subsystem.Besurethat:
• BothRAIDcontrollersarepresent,fullyinsertedintotheirslots,andlockedintoplace.
• TheRAIDcontrollersmatch,meaningbothareFibreChannelorbothareiSCSI.
• All SAS expansion cables from the RAID controllers to external JBOD units in good condition and are
securelyconnected.
Important
A disconnected SAS expansion cable causes the two RAID controllers to see a different
setofcongureddrives.Thisconditionisthemostcommoncauseofacontrollerentering
maintenancemode.
internAl checks
IfallexternalchecksareOK,takethefollowingactions:
1. ShutdowntheASUSDS300fG2.
2. RemoveoneoftheRAIDcontrollers.
See“ReplacingaRAIDController–DualControllers”onpage180.
3. RestarttheASUSDS300fG2.
4. AftertheASUSDS300fG2isfullybooted,viewthecontrollerinformation.
Seepage60(ASUSStorageManagement)orpage124(CLU).
5. Observeandrecordthefollowinginformationabouttherstcontroller:
• SDRAMmemorysize
• Hardwareversion
• Firmwareversion
6. ShutdowntheASUSDS300fG2.
7. Removetherstcontrollerandinstallthesecondcontroller.
8. Repeatsteps3through6.Thencompareyourrecords.
9. Correctanydifferencesbetweenthetwocontrollers.
See "Updating the Subsystem Firmware" on page <?>.
takInG a raID controller out of maIntenance moDe
IfyoushutdowntheASUSDS300fG2subsystemintheprocessofcorrectingthemaintenancemodeproblem,
the affected RAID controller boots into normal modewhentheASUSDS300fG2restarts.Nofurtheractionis
required.
If you corrected the problem without shutting down the ASUS DS300f G2 subsystem, choose one of the
following methods to take the controller out of maintenance mode:
• Restart the ASUS DS300f G2 subsystem
• Establishaserialconnection,thenusetheCLI
• EstablishaTelnetconnection,thenusetheCLI