Opensolaris I O Error
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Hardware address '08:00:20:xx:xx:xx' trying to how to check i/o error in solaris be our address xxx.xxx.xxx.xxx!I/O error Cause Some mount i/o error solaris 10 physical Input/Output error has occurred. If the process was writing
Fsck In Solaris
a file at the time, data corruption is possible. Action First, find out which device is experiencing
Iostat Solaris
the I/O error. If the device is a tape drive, make sure a tape is inserted into the drive. When this error occurs with a tape in the drive, it is likely that the tape contains an unrecoverable bad spot. If the device is a floppy drive, an unformatted or defective diskette could be at fault. Format the diskette, or obtain a replacement. If the device is a hard disk drive, you might need to run fsck(1M) and possibly even reformat the disk. Technical Notes In some cases this error might occur on a call following the one to which it actually applies. The symbolic name for this error is EIO, errno=5. Previous: Invalid_SS_JWS_HOME:no C:\\lib\basicframe.propertiesNext: IP: Hardware address '08:00:20:xx:xx:xx' trying to be our address xxx.xxx.xxx.xxx! © 2010, Oracle Corporation and/or its affiliates
Performance troubleshooting : Disk (I/O) performance issues An I/O performance bottleneck can be due to a disk or even due to a HBA or a HBA driver. The command iostat (Input output statistics) help us to get started with analyzing a disk I/O bottleneck issue.A standard iostat output would look like :# iostat -xn 1 5 extended device statistics r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device 293.1 0.0 37510.5 0.0 0.0 31.7 0.0 108.3 1 100 c0t0d0 294.0 0.0 37632.9 0.0 0.0 31.9 0.0 108.6 0 100 c0t0d0 293.0 0.0 37504.4 0.0 0.0 31.9 0.0 1032.0 0 100 c0t0d0 294.0 0.0 37631.3 0.0 0.0 31.8 0.0 108.1 1 100 c0t0d0 294.0 0.0 37628.1 0.0 0.0 31.9 0.0 108.6 1 100 c0t0d0The various options that can be used with iostat are : -x --> Extended https://docs.oracle.com/cd/E19455-01/806-1075/msgs-1508/index.html disk statistics. This prints a line per device and provides the breakdown that includes r/s, w/s, kr/s, kw/s, wait, actv, svc_t, %w, and %b. -t --> Print terminal I/O statistics. -n --> Use logical disk names rather than instance names. -c --> Print the standard system time percentages: us, sy, wt, id. -z --> Don't print lines having all zeros.The meaning of each column value in the iostat output is :r/s reads per second w/s writes per second kr/s kilobytes http://thegeekdiary.com/solaris-performance-troubleshooting-series-disk-io-performance-issues/ read per second kw/s kilobytes written per second wait average number of transactions waiting for service (queue length) actv average number of transactions actively being serviced (removed from the queue but not yet completed) svc_t average response time of transactions, in milliseconds %w percent of time there are transactions waiting for service (queue non-empty) %b percent of time the disk is busy (transactions in progress) wsvc_t average service time in wait queue, in milliseconds asvc_t average service time of active transactions, in milliseconds wt the I/O wait time is no longer calculated as a percentage of CPU time, and this statistic will always return zero.The first line in the iostat output is the summary since boot. This line will give you a rough idea of average server I/O on the server. This could be very useful to compare the server I/O performance at the time of performance bottleneck. Now if you see the asvc_t column you would see a constant high value. Generally a value more than 30 to 40 ms is considered to be high. But you can safely ignore a spike of 200 ms in the asvc_t column. Here the interval was 1 sec with a count of 5.Check for Disk FailuresDisk failure could also be a major, infact the only reason in many disk I/O bottleneck issues. To check the disk failure :# iostat -xne extended device statistics ---- errors --- r/s w/s
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