Disk Metrics

Metric Name Description Unit CDH Version
average_queue_length The average queue length of the requests issued to the disk. This is the same as the 'avgqu-sz' measure from iostat. ios n/a
average_request_size The average size in sectors of the requests issued to the disk. This is the same as the 'avgrq-sz' measure from iostat. sectors n/a
await_read_time The average time for read requests issued to the disk to be served. This includes the time spent by the requests in queue and the time spent servicing them. This is the same as the 'r_await' measure from iostat. ms n/a
await_time The average time for requests issued to the disk to be served. This includes the time spent by the requests in queue and the time spent servicing them. This is the same as the 'await' measure from iostat. ms n/a
await_write_time The average time for write requests issued to the disk to be served. This includes the time spent by the requests in queue and the time spent servicing them. This is the same as the 'w_await' measure from iostat. ms n/a
read_bytes_rate The number of bytes read from the device bytes per second n/a
read_ios_rate The number of read I/O operations issued to the device ios per second n/a
service_time The average service time for requests issued to the disk. This is the same as the 'svctm' measure from iostat. Note the warning from iostat for this metric: Warning! Do not trust this field any more. This field will be removed in a future sysstat version. ms n/a
utilization The percentage of CPU time during which I/O requests were issued to the device. This is the same as the 'util' measure from iostat. percent n/a
write_bytes_rate The number of bytes written to the device bytes per second n/a
write_ios_rate The number of write I/O operations issued to the device ios per second n/a