Specifications

DS300f G2 Series User Manual
130
• HighlightDMA ModeandpressthespacebartotogglethroughUDMA0to6andMDMA0to2.
For SAS drives:
•
HighlightWrite CacheandpressthespacebartotogglebetweenEnabledandDisabled.
•
HighlightRead Look Ahead CacheandpressthespacebartotogglebetweenEnabledandDisabled.
•
HighlightCmdQueuingandpressthespacebartotogglebetweenEnabledandDisabled.
•
HighlightMediumErrorThresholdandpressthebackspacekeyto
removethecurrentvalue,thentypeanewsmallervalue.
Seethecommentsbelow.
• HighlightRead CacheandpressthespacebartotogglebetweenEnabledandDisabled.
4. Press Control-A to save your settings.
See “Viewing Physical Drive Information” below to determine which functions your physical drives
support.
Medium Error Threshold is the number of bad blocks tolerated before the controller marks the drive as
Dead. The default setting is 64 blocks. A setting of zero disables the function. When disabled, no drives are
markedofineevenwhenerrorsaredetected.
vIewInG PhySIcal DrIve InformatIon (clu)
To view information about a physical drive:
1. From the Main Menu, highlight Physical Drive Management and press Enter.
2. Highlight the physical drive you want and press Enter.
Basic information displays.
3. Highlight Advanced Information and press Enter.
Advanced information displays.
vIewInG PhySIcal DrIve StatIStIcS (clu)
To view the statistics for the selected physical drive:
1. From the Main Menu, highlight Physical Drive Management and press Enter.
2. Highlight the physical drive you want and press Enter.
3. Highlight Physical Drive Statistics and press Enter.
cleAring stAtistics
To clear physical drive statistics, see "Clearing Statistics (CLU)" on page 167.
SettInG an alIaS (clu)
An alias is optional. To set an Alias for a physical drive:
1. From the Main Menu, highlight Physical Drive Management and press Enter.
2. Highlight the physical drive you want and press Enter.
3. Typeanaliasintotheeldprovided.
Maximum of 32 characters. Use letters, numbers, space between words and underscore.
4. Press Control-A to save your settings.
clearInG Stale anD Pfa conDItIonS (clu)
The Clear Stale and Clear PFA functions only appear when those conditions exist on the physical drive. To clear
a Stale or PFA condition on a physical drive:
1. From the Main Menu, highlight Physical Drive Management and press Enter.
2. Highlight the physical drive you want and press Enter.
3. Highlight Clear Stale or Clear PFA and press Enter.
If a physical drive is still online and shows a PFA error but “Clear PFA” does not appear, use PDM to copy
the data to a new physical drive. See “Running PDM on a Disk Array” on page 136.
IfaphysicaldriveisofineandshowsaPFAerror,rebuildthediskarray.See“Rebuilding a Disk Array”