NonStop S-Series Operations Guide (G06.24+)

Disk Drives: Monitoring and Recovery
HP NonStop S-Series Operations Guide—522459-007
9-11
Identifying Disk Drive Problems
Identifying Disk Drive Problems
The most common disk drive problems on a NonStop S-series server include:
•
Space problems such as full disks or free-space fragmentation
•
Stopped disks
•
Performance problems
•
Defective tracks or sectors
Table 9-2 lists the most common disk drive problems and their possible symptoms.
For recovery operations, refer to Recovery Operations for Disk Drives on page 9-12.
Table 9-2. Possible Causes of Common Disk Drive Problems
Problems Possible Symptoms
A disk is full. A disk does not have the
amount of space requested.
Error 43 (unable to obtain disk space for file
extent) occurs.
If the disk is full, an application might go down.
Disk free-space fragmentation has
occurred.
Error 43 (unable to obtain disk space for file
extent) occurs.
One disk in a mirrored pair is down. A related event message from the storage
subsystem is generated, but the application
continues to run.
An unmirrored disk is down, or both disks
in a mirrored pair are down.
Users report access problems, an application
goes down, and related event messages from
the storage subsystem are generated.
Performance problems are occurring due
to path switches.
Users report poor application performance.
Performance problems are occurring due
to a cache size that is too small.
There are defective tracks or sectors. The output from the SCF INFO DISK, BAD
command indicates unspared defective
sectors.