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| StorNext File System Tuning |
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| The Metadata Controller System |
| This setting is adjustable using the cvupdatefs utility. For more | |
| information, see the cvupdatefs man page. | |
| Example: JournalSize | 16M |
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SNFS Tools | The snfsdefrag tool is very useful to identify and correct file extent | |
| fragmentation. Reducing extent fragmentation can be very beneficial | |
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| for performance. You can use this utility to determine whether files are | |
| fragmented, and if so, fix them. If your files are prone to fragmentation |
you should also use the FSM config file tuning options to minimize fragmentation. These global configuration settings are InodeExpandMin, InodeExpandInc, and InodeExpandMax. (For more information, see the man cvfs_config page.) The snfsdefrag man page explains the command options in greater detail.
FSM hourly statistics reporting is another very useful tool. This can show you the mix of metadata operations being invoked by client processes, as well as latency information for metadata operations and metadata and journal I/O. This information is easily accessed in the cvlog log files. All of the latency oriented stats are reported in microsecond units.
It also possible to trigger an instant FSM statistics report by setting the Once Only debug flag using cvadmin. For example:
cvadmin
The following items are a few things to watch out for:
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StorNext File System Tuning Guide | 15 |