Hdlm Installation Solaris Download Freeforcebackuper

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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 :

The various options that can be used with iostat are :

The meaning of each column value in the iostat output is :

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.

Hdlm Installation Solaris Download Freeforcebackuper

Check for Disk Failures

Disk failure could also be a major, infact the only reason in many disk I/O bottleneck issues. To check the disk failure :

Check the columns s/w (soft errors), h/w (hard errors), trn (transport errors) and tot (total errors). The meanings of various errors is :

Soft error : A disk sector fails the CRC check and needs to be re-read
Hard error : Re-read fails several times for CRC check
Transport error : Errors reported by I/O bus
Total errors : Soft error + Hard error + Transport errors

A large number of any of these errors (especially increasing hard errors) may point that the disk is either failed already or is on its way to fail. Another command to check the errors on the disk is :

System activity reporter (sar) to check disk I/O

Sar (system activity reporter) is another command to check the disk I/O. Before start using sar enable the sar service using svcadm if not already enabled :

To check the disk I/O statistics using sar, we can run it by giving an interval of 2 sec and 10 counts.