Seagate ST336704FC Guia de Configuração descarregar pdf (Página 28)

Chapter 1: HP Clustered File System Commands 22

Show Number of Transient Errors

The mpiostat command lists the number of transient errors for each

target and shows the number of failovers and fatal errors for each device.

Values represent the number of respective events since the device was

bound. If devices have not been rebound since boot, then this represents

the number of events since boot.

Show Load Statistics

The mpioload command shows the load (number of pending I/Os, both

total and raw) for each target (SCSI command I/Os) and total for the PSD

device (block layer I/Os), number of failovers, and fatal errors for each

device.

The syntax is:

mpioload [interval [count]]

interval is the number of seconds between samplings. The default is one

second. count is the number of samples to make; the default is to sample

indefinitely.

Values for failovers and fatal errors represent the number of respective

events since the device was bound. Values for load are the instantaneous

number of I/Os queued at the time of the sample. Raw I/Os are counted as

requests (calls to read()/write()) while total (block layer) I/Os are per

buffer_head structure (i.e., call to make_request()).

Display General I/O Statistics

The iostat command displays general I/O statistics for each device.

Specific targets of PSD devices are not monitored individually. The

syntax is:

iostat [interval [count]]

interval is the number of seconds between samplings. The default is one

second. count is the number of samples to make; the default is to sample

indefinitely.

The information displayed for each interval includes the number of I/Os

queued (total block and raw), minimum and maximum latency, count of

I/Os, and average latency. The statistics are organized by I/O, with only

actively used sizes shown.

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Seagate ST336704FC Guia de Configuração Página 28