User's Manual

hp StorageWorks File System Extender User Guide 117
NOTE: Zero-sized files remain permanently online. They cannot be migrated nor released.
Limitations
• Only sets of files can be excluded from the release process. You cannot exclude directories.
• When an FSE partition is reconfigured by modifying the ExcludeFromRelease variable, the
contents of the corresponding release candidate list is not affected. This means that:
• Files that have previously been excluded from release, but are not now excluded by the reconfigured
ExcludeFromRelease parameter, will not be released until they are migrated or recalled again.
• Files that are on the release candidate list, and are now excluded from release by the reconfigured
ExcludeFromRelease parameter, will be released. They will be excluded from release only after
their first subsequent migration or recall.
Considerations before configuring exclusion from release
Keep in mind that configuring files for exclusion from release such that the total size of the excluded files is
relatively large can cause undesirable consequences. In these cases, you may experience the following
symptoms:
• The frequency of reaching the high and critical watermarks on the HSM file system increases. The more
the total disk space is occupied by excluded files, the greater the frequency of reaching the
watermarks.
• The low watermark is never reached. This happens when the total amount of disk space used for storing
the excluded files exceeds the low watermark size configured on the corresponding FSE partition.
These inconveniences are a logical consequence of permanently maintaining a greater number of files on
the HSM file system. You can try to minimize their effects by keeping the number and size of excluded files
within reasonable bounds. You may also want to consider adjusting the watermark values.
Filename pattern conventions
An ExcludeFromRelease variable configuration includes a comma-separated list of filenames or
filename patterns or both. Filename patterns are defined by special pattern-matching characters.
The scope of filenames and filename patterns is over an entire HSM file system. All files on a particular FSE
partition whose filenames match the specified names or patterns are excluded from release. Although you
can specify full paths with filenames, only the filename part of the filename pattern is considered for
pattern matching - the directory part is ignored.
The following are examples of properly configured ExcludeFromRelease variables:
[ ReleaseFiles ]
MigRetentionTime = "1h"
RecallRetentionTime = "2h"
MinFileSize = "2kB"
ExcludeFromRelease = (*.exe, *.ini, fse_*, "[0-9]*")
[ ReleaseFiles ]
MigRetentionTime = "2h"
RecallRetentionTime = "10h"
MinFileSize = "2kB"
ExcludeFromRelease = ("*_[a-z].tgz", *.x??, core, "*,v")
[ ReleaseFiles ]
MigRetentionTime = "2m"
RecallRetentionTime = "4m"