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- /* Copyright (c) 1984, 1986, 1987, 1988 AT&T */
- /* All Rights Reserved */
-
- /* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
- /* The copyright notice above does not evidence any */
- /* actual or intended publication of such source code. */
-
-
- #ident "@(#)head.sys:elog.h 1.3"
-
- /*
- * "True" major device numbers. These correspond
- * to standard positions in the configuration
- * table, but are used for error logging
- * purposes only.
- */
-
- #define CNTL 1
- #define SYS 2
- #define CAC 3
- #define PF 4
-
- /*
- * IO statistics are kept for each physical unit of each
- * block device (within the driver). Primary purpose is
- * to establish a guesstimate of error rates during
- * error logging.
- */
-
- struct iostat {
- long io_ops; /* number of read/writes */
- long io_misc; /* number of "other" operations */
- long io_qcnt; /* number of jobs assigned to drive */
- ushort io_unlog; /* number of unlogged errors */
- };
-
- /*
- * structure for system accounting
- */
- struct iotime {
- struct iostat ios;
- long io_bcnt; /* total blocks transferred */
- time_t io_resp; /* total block response time */
- time_t io_act; /* total drive active time (cumulative utilization) */
- int io_pad; /* round size to 2^n */
- };
- #define io_cnt ios.io_ops
- #define io_qc ios.io_qcnt
- /* drive utilization times can be calculated by system software as follows */
-
- /* Average drive utilization = (io_cact/io_elapt) */
- /* Average drive utilization for last interval = (io_liact/io_intv) */
-