General Operating Guidelines and Limitations

 

 

Operating System /

 

Affected Component

Description

 

 

All

As of SNFS 2.7, a change was made to the way that the Reserved Extents

 

performance feature affects free space reporting. In the previous release,

 

SNFS would reserve a certain amount of disk space which would cause

 

applications to receive an out of space error before the disk capacity reached

 

100%.

 

In the current release, this reserved space is treated as allocated space. This

 

allows applications to perform allocations until the file system is nearly full.

 

NOTE: Due to allocation rounding, applications may still receive a premature

 

out of space error, but only when there are just a few megabytes of space

 

remaining. In the worst case, the error will be returned when the reported

 

remaining space is:

 

(InodeExpandMax * #-of-data-stripe-groups)

 

One side effect of this change is that after creating a new file system, df will

 

show that space has been used, even though no user data has been allocated.

 

The amount of reserved space varies according to client use but does not go

 

below a “floor” of a few gigabytes per data stripe group. The amount of

 

reserved space at any time can be seen using the cvadmin command, selecting

 

the file system, and using show long.

 

While not recommended, the Reserved Extents feature can be disabled by

 

applying the following setting to the Globals section of the FSM

 

configuration file:

 

ReservedSpace No

 

This will cause the file system to not reserve space for buffered I/O, thereby

 

reducing buffer cache performance and possibly causing severe

 

fragmentation.

 

For more information, see The Reserved Space Parameter on page 327 and

 

the cvfs_config(4) man page.

 

 

StorNext User’s Guide

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Quantum 3.5.1 manual File system, and using show long
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3.5.1 specifications

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