Jun
19
2003
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The Cleaning Crew Is Here |
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NetBackup
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Written by Paul Winkeler
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Thursday, 19 June 2003 |
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Run enough tapes through tape drives and eventually the accumulated dust and rubbed of tape particles will affect the drives' ability to read and write. The good news is that all modern tape drives have a read-behind-write design which allows them to detect this condition. When a head-cleaning is required these drives will send out an alert on their SCSI bus.
The response to this SCSI alert depends on how NetBackup and the hosting robot, where applicable, are configured. Read on to see what your options are:
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Last Updated ( Thursday, 26 April 2007 )
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Read more...
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Jun
04
2003
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Name, Rank and Serial Number |
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NetBackup
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Written by Paul Winkeler
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Wednesday, 04 June 2003 |
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Between NetBackup's use of volume databases and media manager databases, in addition to referring to individual volumes by mediaid and ev it is not too difficult to loose a volume or, worse yet, end up with two identically named volumes. This article aims to remove any and all confusion with regard to which Volume Serial Number is used in which database for what purposes. |
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Last Updated ( Thursday, 26 April 2007 )
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May
16
2003
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StorageTek T9940B Performance Data |
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Performance
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Written by Paul Winkeler
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Friday, 16 May 2003 |
The fine folks at SA/N, Inc., publishers of the annual Mass Storage Report since 1991, have chosen to incorporate StorageTek T9940B tape drive performance data gathered by PBnJ Solutions. The data highlight the need to take Host Bus Adapter (HBA) performance and even PCI Bus capacity into account when designing tape backup solutions since these drives are able to write at speeds up to 70MByte/sec!
Specifically the equipment used in testing T9940B througput was:
Hosts:
Host Bus Adapters
SAN Switches
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May
06
2003
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Drive Don't Fail Me Now |
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NetBackup
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Written by Paul Winkeler
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Tuesday, 06 May 2003 |
Whenever I walk into a meeting with a prospective customer and I hear that their main problem consists of a never-ending string of backup failures, you can bet the air will be filled with additional remarks such as "it didn't used to be this bad" and "the other guy thought we had some bad tapes, but I think it's the drives", and so on.
As the all-knowing consultant I have at least one trick up my sleeve to try and settle this debate so I will propose to graph for them a listing of every media/drive related backup failure over the course of their current installation. Many of you will know that I am going to rely on the media manager files stored at
/usr/openv/netbackup/db/media/errors
Unless the media managers were wiped and re-installed, these error log files are going to contain a record of every media failure ever recorded on that machine. And yet this falls far short of what we should expect an enterprise class product such as Veritas NetBackup to provide for the management of the media and hardware under its control... |
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Last Updated ( Thursday, 26 April 2007 )
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Read more...
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Mar
15
2003
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Failed NetBackup Jobs: Retry vs Requeue |
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NetBackup
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Written by Paul Winkeler
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Saturday, 15 March 2003 |
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Many NetBackup users find themselves wondering under what circumstances a job is retried vs requeued. This is really a trick question as these two states are not mutually exclusive at all. Instead, they are tightly coupled and well as follows... |
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Last Updated ( Thursday, 26 April 2007 )
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Read more...
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