NonStop S-Series Operations Guide (G06.27+)

Disk Drives: Monitoring and Recovery
HP NonStop S-Series Operations Guide—522459-008
9-12
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 9-13.
Internal SCSI Disk Drives
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. Possible Causes of Common Disk Drive Problems
Problems Possible Symptoms
A disk is full or does not have enough
space.
Error 43 (unable to obtain disk space for file
extent) occurs.
If the disk is full, an application might go down.
Disk free space is fragmented. 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 occur due to path
switches or a cache size that is too small.
Users report poor application performance.
Defective tracks or sectors exist. Output from the SCF INFO DISK, BAD
command indicates unspared defective
sectors.
Disk errors exceed a certain limit. Intm-errors-exceeded message.
Slow I/O operations exceed a certain limit. Slow-IOs-threshold-exceeded message.