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Metalogix StoragePoint 5.8 - File System Adapter Guide

Shred BLOB Files on Delete

The Shred on Delete option will cause the Unused BLOB Cleanup Job and Recall jobs to do a “secure” delete when they remove files from the external BLOB store. A “secure” delete consists of writing several passes of 0’s, 1’s and random bit patterns over the file before deleting it on the file store. This prevents the file from being recovered using file deletion recovery tools.

This option is turned on by appending ;ShredOnDelete=true to the Connection string of a profile that uses the FileSystem adapter:

Click the Show Connection String checkbox to edit the string.
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Or, click the Show link next to the Advanced Adapter Settings to see the drop down field.
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Please keep the following limitations in mind when using this feature:

·Deletions of BLOB files only occur when the Unused BLOB Cleanup and Recall jobs remove them. Deleting a document in SharePoint does not immediately remove it from the BLOB store.

·Not all devices support secure delete. Most SCSI and SATA drives support the necessary device options. Some CIFS shares and other remote file store devices may not support it. It is important to test the option after turning it on.

·Many dedicated filer devices offer device level secure delete (i.e. HCAP, Centera, etc.). It is preferable to use the device’s capabilities if they are present.

·Deletes of BLOB files are never guaranteed. Although unlikely, it is possible a BLOB file may be “leaked” on the BLOB store and not cleaned up by the Unused BLOB Cleanup Job. Metalogix StoragePoint support has tools to help clean these up periodically.

·This option is specific to the Metalogix StoragePoint FileSystem adapter. It does not work on other storage adapters.

Deletion Audit

The Deletion Audit option stops Metalogix StoragePoint from physically deleting orphaned BLOB files. Instead they are renamed with a .DEL extension. In addition, every time Metalogix StoragePoint attempts to delete a BLOB file, a log entry is made in the SharePoint logs to identify information about the deletion. This option should be used if removal of content BLOBs from the file store needs to be audited first. In this case, the removal of the .DEL files is the responsibility of the client (i.e. Metalogix StoragePoint does not remove these).

This option is turned on by appending ;AuditDelete=true to the Connection string of a profile that uses the FileSystem adapter:

Click the Show Connection String checkbox to edit the string.
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Or, click the Show link next to the Advanced Adapter Settings to see the drop down field.
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Buffer Size

The Buffer Size option is used to override the Metalogix StoragePoint read/write buffer size default of 8192. The Metalogix StoragePoint default is tuned for maximum performance on most devices. The value can be modified if it is suspected that a different buffer size would be more optimal for a given device. Please be aware that it is recommended that you not change this setting and that increasing it does not necessarily increase performance. In fact, in many cases, increasing it will decrease performance.

This option is specified by appending ;BufferSize=xxxx (where xxxx is the size to make the buffer) to the Connection string of a profile that uses the FileSystem adapter.

Click the Show Connection String checkbox to edit the string.
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Or, click the Show link next to the Advanced Adapter Settings to see the text field.
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Support Metadata

The Support Metadata option causes an additional file to be created for each BLOB written. This additional file will share the same name as the BLOB and include an extension of ".xml". It contains a snapshot of available SharePoint metadata. This metadata file will be created and populated on a "best effort" basis. The metadata snapshot file lives in the BLOB-store until the BLOB itself is deleted. At that time the xml file is also removed.

 

This option is turned on by appending ;UseMeta=True to the Connection string of a profile that uses the FileSystem adapter. This behavior is turned off by default and must be turned on explicitly if desired.

 

Click the Show Connection String checkbox to edit the string.
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Or, click the Show link next to the Advanced Adapter Settings to see the drop down fields.
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Please keep the following limitations in mind when using this feature:

·Enabling this option takes slightly more space in the BLOB-store in order to accommodate the metadata.

·Enabling this option may result in slightly longer times to perform BLOB writes and deletions.

·Metadata is written asynchronously compared to the actual BLOB contents. As a result there can be a lag between the commit of a BLOB and its associated metadata.

·This option is specific to the Metalogix StoragePoint FileSystem adapter. Please see the documentation of our other adapter(s) to find out if and how metadata is supported.

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