No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

[VTL6000] VTL software problem: storage device power off during duplicated data delete cause index tape existing

Publication Date:  2012-10-15 Views:  26 Downloads:  0
Issue Description
Storage device power off during process of VTL server duplicated data delete, duplicated data delete task excerpts. After storage device power on again, it is discovered that tape is mounted under SIR driver in VTL console navigation tree. Concrete phenomenon express like:
1. In VTL console navigation tree, select VTL system > duplicate delete policy, and select concrete duplicate delete policy, single click on event log tab on right operation zone, check error information.
It is discovered that tape is mounted under SIR driver in VTL console navigation tree. In VTL console navigation tree, select VTL system > VTL > tape, and single click on general tab on right operation zone, check tape assignment type. If assignment type of this tape is virtual tape (pure VTL), then data in this tape must be virtual index. If assignment type of this tape is virtual type, data in this tape must be original data; if assignment type of this tape is virtual tape (combined VTL), there must be combined original data and previous virtual index.
Alarm Information
Na
Handling Process
Method 1: storage power off during process of scan tape 28.
1. Log on VTL server with SSH(Secure Shell)tool, input vtl restart to reboot VTL service.
2. In VTL console navigation tree, select VTL system > virtual warehouse, delete SIR tape in virtual warehouse.
3. Right click on VTL server > option > duplicate delete > recycle > start space recycle, and recycle data existing in SIR data storage space before duplicate delete interruption.
Method 2: storage device power off during process of exchange tape 28 and tape 19.
1. Log on VTL server with SSH tool, input vtl restart to reboot VTL service.
2. In VTL console navigation tree, select VTL system > virtual warehouse, delete SIR tape in virtual warehouse.
3. In VTL console navigation tree, right click on duplicate data delete policy, select run, task succeeds. 


Root Cause
Assume virtual ID of duplicate data delete tape is 28, tape 28 for short, data in this tape is original data, and the process of duplicate data delete is like below:
1. VTL server creates a new tape to store index, assume virtual ID is 29, and tape 29 for short.
2. SIR server load tape 28 and tape 29, and begin scan tape 28.
3. During SIR server scan, store index generated by duplicate data delete into tape 29, store data block generated by duplicate data delete into SIR data store space.
4. After SIR server scan complete, change assignment tape of tape 29 into VTL (virtual index tape).
5. VTL server exchange virtual ID of tape 28 and tape 29. After exchange complete, tape 28 is VIT for storing index, tape 29 is duplicate data delete tape for storing original data.
6. Move tape 29 into virtual warehouse.
7. Delete tape 29, duplicate data delete finish.
Storage device power off during duplicate data delete, it would cause duplicate data delete task failure. At this time, tape of duplicate data delete is still not deleted, and new created tape for index is not deleted yet. If tape of duplicate data delete and virtual index tape are in the same anchor slot and do backup task and manipulator catch tape in this slot for storing backup data, driver cannot decide which tape to load.
Possible cause for backup task failure after storage device power on is like below, it needs to check: storage device power off during process of scanning tape 28 or process of exchange tape 28 and tape 29.   

Suggestions
Na

END