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тАО08-25-2003 06:29 AM
тАО08-25-2003 06:29 AM
we are using a HP surestore 2/20 tape library that is fiber connected to a HP netserver running win2k server and Backup Exec v8.6.
Normally, I run a backup of a server and perform a verify after backup. This is taking quit some time.
When one of the tape devices crashed recently, we had a HP technician replacing the drive. He told me that I wouldn't have to do a verify since the HP library is doing it for me by default. Is this true?????
If so, I would be very happy, since it would cut down the backup window.
Regards,
Dennis Appelboom
marviQ
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тАО08-25-2003 06:51 AM
тАО08-25-2003 06:51 AM
Re: Is a verify needed after a backup?
Normally there is no need for verifying a media, DLT and LTO medias is very reliable. Verify only if you suspect a problem with a media (for example if there has been read or write errors when backing up or restore. Verifying increases the wear of both the media and the drives.
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тАО08-26-2003 01:58 AM
тАО08-26-2003 01:58 AM
Solutionthere is a functionality built-in the DDS,DLT,LTO technology called RAW(Read after Write), that means that each data byte written on the tape is immediately readed, and compared with the original data. This is posssible because the head module of Tape device have both write and read head alligned on the tape at the same time. One of the parameter you can check with L&TT is the RAW errors.
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тАО08-26-2003 02:10 AM
тАО08-26-2003 02:10 AM
Re: Is a verify needed after a backup?
Why do you need 2 pieces of backup if software is unable to resore it? So sometimes make sure that you can restore before something bad may happen
Eugeny
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тАО08-26-2003 06:34 AM
тАО08-26-2003 06:34 AM
Re: Is a verify needed after a backup?
I'll consider to stop the verify.
Regards,
Dennis Appelboom