asr.tech.notes

http://www14.software.ibm.com/webapp/set2/sas/f/vios/documentation/perf.html Reproduced from the link posted above: The VIOS online pubs in InfoCenter include sections on sizing for both Virtual SCSI and SEA. http://publib.boulder.ibm.com/infocenter/eserver/v1r2s/en_US/index.htm For Virtual SCSI, please see the section titled "Virtual SCSI Sizing Considerations". For SEA, please see the section titled "Planning for shared Ethernet adapters." QOS considerations The Virtual I/O server is a shared resource that can be shared concurrently by Virtual SCSI and by Virtual Ethernet / Shared Ethernet. Depending on the specific configuration of a Virtual I/O server, quality of service issues (long response times) may be encountered if insufficient CPU resources exist on the I/O server partition for the I/O load required. Recommendations for sizing and tuning the Virtual I/O server are discussed in the following paragraphs. The Virtual Ethernet and Shared Ethernet drivers ...

First, list all the HBAs, in the output below the HBA device name is /dev/td0 and /dev/td1 my-hp-system# ioscan -fnkC fc Class I H/W Path Driver S/W State H/W Type Description ================================================================= fc 0 0/4/0/0 td CLAIMED INTERFACE HP Tachyon TL/TS Fibre Channel Mass Storage Adapter /dev/td0 fc 1 0/7/0/0 td CLAIMED INTERFACE HP Tachyon TL/TS Fibre Channel Mass Storage Adapter /dev/td1 Now, use the fcmsutil to find the WWN and other information related to each of these HBAs: my-hp-system# fcmsutil /dev/td0

Here is a easy way to find the top paging space users using a svmon command: my-system> svmon -P -O sortseg=pgsp Unit: page -------------------------------------------------------------------------------      Pid Command          Inuse      Pin     Pgsp  Virtual 2289864 sshd             18908     7988        0    18414 2265260 ksh              18499     7988        0    18427 1765570 svmon            17398     8032        0    17337

The easiest way to test throughput between 2 AIX servers is to do a FTP test, generating data transfer with ‘dd’ command.  This will provide the throughput/speed for the specified amount of data transfer: #src-system> ftp dst-system … … ftp>  put "|dd if=/dev/zero bs=32k count=10000" /dev/null 200 PORT command successful. 150 Opening data connection for /dev/null. 10000+0 records in 10000+0 records out 226 Transfer complete. 327680000 bytes sent in 1.406 seconds (2.277e+05 Kbytes/s) local: |dd if=/dev/zero bs=32k count=10000 remote: /dev/null ftp>bye   This is the same test IBM recommends in the redbook and also during a support call