Best Practices: Autonomic Healing
Summary
This article describes the Autonomic Healing Best Practices in order to improve the scanning speed of the Autonomic Healing processes.
Considerations that affect the Autonomic Healing Scan Speed
Autonomic Healing is designed to be scheduled to run continuously in the background to check the DS-System Online Storage. When scheduled, it features a speed throttle that enables the Module to slow down when the DS-System is experiencing a high load of activities.
There are some considerations that affect the time it takes to complete one pass through the entire Online Storage:
- Number of files on DS-System storage locations (more files on each storage location makes Autonomic Healing scanning slower).
- Number of storage locations on the DS-System: This directly determines the number of links between different storage locations. If Autonomic Healing has to follow more links, it will be slower.
- Number of Autonomic Healing processes running on one DS-System Storage location at the same time from multiple nodes.
To improve the Autonomic Healing scan speed you may check / configure the following:
1. Setup > Autonomic Healing > Autonomic Healing Manager > Set Options:
- Do not select the "Force DR Scan" option. This option forces DS-System to verify all storage locations for a file, which increases the duration of the Autonomic Healing scan.
2. Setup > Advanced Configuration:
- Set the Advanced Configuration value of "DeltaCheckOption" to 0. If this option is 0, Autonomic Healing will validate only meta-data information about the files. This reduces the scan time because it instructs Autonomic Healing to not validate the delta block signatures (the file content).
3. Setup > Autonomic Healing > Start Autonomic Healing: "Processes to start [...]"
- Running more Autonomic Healing processes may not significantly increase the scan speed. However, it may decrease the overall performance of your DS-System (due to the increased I/O to the Online Storage).
Improvements in different major release versions
It is always recommended that you use the latest official release (and service pack \ hot fix).
- In v.9.0, the DS-System storage structure has been upgraded so that large amounts of small files are consolidated into larger files. In some situations, this upgrade may yield significant Autonomic Healing scan speed improvements (up to 200 times faster).
- In v.8.0, there are some additional (internal) speed improvements for the Autonomic Healing process.
DeltaCheckOption was not configurable in earlier versions of the software:
- In v.8.0 (and up), the default setting is "0" (validate only meta-data information about the files).
- In v.7.0 (only) the default was the same as the current setting of "2" (Autonomic Healing validated the file content). This caused some noticeable slowdowns in the Autonomic Healing scan speed for customers who were used to the previous version.
- In v.6.2 (and lower) the default was the same as the current setting of "0" (validate only meta-data information about the files).
See Also
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