V$ASM_DISK_IOSTAT

V$ASM_DISK_IOSTAT displays information about disk I/O statistics for each ASM client. If this view is queried from the database instance, only the rows for that instance are shown.

Column	Datatype	Description
`INSTNAME`	`VARCHAR2(64)`	Identifier for the DB/ADVM instance client
`DBNAME`	`VARCHAR2(8)`	Unique database name (`DB_UNIQUE_NAME`)
`GROUP_NUMBER`	`NUMBER`	Number of the disk group containing the disk
`DISK_NUMBER`	`NUMBER`	Number assigned to the disk within its disk group
`FAILGROUP`	`VARCHAR2(30)`	Name of the failure group to which the disk belongs
`READS`	`NUMBER`	Total number of I/O read requests for the disk
`WRITES`	`NUMBER`	Total number of I/O write requests for the disk
`READ_ERRS`	`NUMBER`	Total number of failed I/O read requests for the disk
`WRITE_ERRS`	`NUMBER`	Total number of failed I/O write requests for the disk
`READ_TIME`	`NUMBER`	Total I/O time (in seconds) for read requests for the disk if the `TIMED_STATISTICS` initialization parameter is set to `TRUE` (`0` if set to `FALSE`).
`WRITE_TIME`	`NUMBER`	Total I/O time (in seconds) for write requests for the disk if the `TIMED_STATISTICS` initialization parameter is set to `TRUE` (`0` if set to `FALSE`)
`BYTES_READ`	`NUMBER`	Total number of bytes read from the disk
`BYTES_WRITTEN`	`NUMBER`	Total number of bytes written from the disk
`HOT_READS`	`NUMBER`	Number of reads from the hot region on disk
`HOT_WRITES`	`NUMBER`	Number of writes to the hot region on disk
`HOT_BYTES_READ`	`NUMBER`	Number of bytes read from the hot region on disk
`HOT_BYTES_WRITTEN`	`NUMBER`	Number of bytes written to the hot region on disk
`COLD_READS`	`NUMBER`	Number of reads from the cold region on disk
`COLD_WRITES`	`NUMBER`	Number of writes to the cold region on disk
`COLD_BYTES_READ`	`NUMBER`	Number of bytes read from the cold region on disk
`COLD_BYTES_WRITTEN`	`NUMBER`	Number of bytes written to the cold region on disk