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Server 2003 - NTBackup not compressing files to tape

Guest Donald Campbell

By Guest Donald Campbell
in Windows 2003 Server

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Guest Donald Campbell

Guest Donald Campbell

Posted
Posted

Backing up to DDS tape.

 

Compression is enabled on the drive, but when NTBackup runs it only puts

on the native amount before asking for a second tape.

 

NTBackup is told to use compression if possible.

 

Any ideas (apart from don't use NTBackup).

 

 

Don

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Guest Pegasus \(MVP\)

Guest Pegasus \(MVP\)

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

 

"Donald Campbell" <Donald@suedon.co.uk> wrote in message

news:IcdGCdIJJbwHFAG5@suedonltd.demon.co.uk...

>

> Backing up to DDS tape.

>

> Compression is enabled on the drive, but when NTBackup runs it only puts

> on the native amount before asking for a second tape.

>

> NTBackup is told to use compression if possible.

>

> Any ideas (apart from don't use NTBackup).

>

>

> Don

>

 

The key is in the phrase "use compression if possible". I suspect

that your backup drive does NOT offer hardware compression.

Many manufacturers state a tape capacity of 20/40 GBytes

(uncompressed/compressed) (for example) but fail to state that

this refers to ***software*** compression. I consider this

misleading.

 

In other words, unless your tape drive has inbuilt hardware

compression, you're stuck with the lower capacity figure.

Guest Donald Campbell

Guest Donald Campbell

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

In article <#ONzmKxdIHA.4144@TK2MSFTNGP05.phx.gbl>, "Pegasus (MVP)"

<I.can@fly.com.oz> writes

>

>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>news:IcdGCdIJJbwHFAG5@suedonltd.demon.co.uk...

>>

>> Backing up to DDS tape.

>>

>> Compression is enabled on the drive, but when NTBackup runs it only puts

>> on the native amount before asking for a second tape.

>>

>> NTBackup is told to use compression if possible.

>>

>> Any ideas (apart from don't use NTBackup).

>>

>>

>> Don

>>

>

>The key is in the phrase "use compression if possible". I suspect

>that your backup drive does NOT offer hardware compression.

>Many manufacturers state a tape capacity of 20/40 GBytes

>(uncompressed/compressed) (for example) but fail to state that

>this refers to ***software*** compression. I consider this

>misleading.

>

>In other words, unless your tape drive has inbuilt hardware

>compression, you're stuck with the lower capacity figure.

>

>

 

 

Looking at the Windows "hardware" set-up the driver for the tape states

"compression enabled".

 

HP diagnostics indicates that the drive is fine.

 

 

Don

Guest Pegasus \(MVP\)

Guest Pegasus \(MVP\)

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

 

"Donald Campbell" <Donald@suedon.co.uk> wrote in message

news:T8pAKILbnbwHFAGO@suedonltd.demon.co.uk...

> In article <#ONzmKxdIHA.4144@TK2MSFTNGP05.phx.gbl>, "Pegasus (MVP)"

> <I.can@fly.com.oz> writes

>>

>>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>>news:IcdGCdIJJbwHFAG5@suedonltd.demon.co.uk...

>>>

>>> Backing up to DDS tape.

>>>

>>> Compression is enabled on the drive, but when NTBackup runs it only puts

>>> on the native amount before asking for a second tape.

>>>

>>> NTBackup is told to use compression if possible.

>>>

>>> Any ideas (apart from don't use NTBackup).

>>>

>>>

>>> Don

>>>

>>

>>The key is in the phrase "use compression if possible". I suspect

>>that your backup drive does NOT offer hardware compression.

>>Many manufacturers state a tape capacity of 20/40 GBytes

>>(uncompressed/compressed) (for example) but fail to state that

>>this refers to ***software*** compression. I consider this

>>misleading.

>>

>>In other words, unless your tape drive has inbuilt hardware

>>compression, you're stuck with the lower capacity figure.

>>

>>

>

>

> Looking at the Windows "hardware" set-up the driver for the tape states

> "compression enabled".

>

> HP diagnostics indicates that the drive is fine.

>

>

> Don

>

 

Rather than relying on what the driver says, I would check the

manufacturer's data sheet.

Guest Donald Campbell

Guest Donald Campbell

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

In article <#l$d4bxdIHA.1824@TK2MSFTNGP02.phx.gbl>, "Pegasus (MVP)"

<I.can@fly.com.oz> writes

>

>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>news:T8pAKILbnbwHFAGO@suedonltd.demon.co.uk...

>> In article <#ONzmKxdIHA.4144@TK2MSFTNGP05.phx.gbl>, "Pegasus (MVP)"

>> <I.can@fly.com.oz> writes

>>>

>>>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>>>news:IcdGCdIJJbwHFAG5@suedonltd.demon.co.uk...

>>>>

>>>> Backing up to DDS tape.

>>>>

>>>> Compression is enabled on the drive, but when NTBackup runs it only puts

>>>> on the native amount before asking for a second tape.

>>>>

>>>> NTBackup is told to use compression if possible.

>>>>

>>>> Any ideas (apart from don't use NTBackup).

>>>>

>>>>

>>>> Don

>>>>

>>>

>>>The key is in the phrase "use compression if possible". I suspect

>>>that your backup drive does NOT offer hardware compression.

>>>Many manufacturers state a tape capacity of 20/40 GBytes

>>>(uncompressed/compressed) (for example) but fail to state that

>>>this refers to ***software*** compression. I consider this

>>>misleading.

>>>

>>>In other words, unless your tape drive has inbuilt hardware

>>>compression, you're stuck with the lower capacity figure.

>>>

>>>

>>

>>

>> Looking at the Windows "hardware" set-up the driver for the tape states

>> "compression enabled".

>>

>> HP diagnostics indicates that the drive is fine.

>>

>>

>> Don

>>

>

>Rather than relying on what the driver says, I would check the

>manufacturer's data sheet.

>

>

 

Diagnostics says that it can and the spec says that it does.

 

Don

Guest Pegasus \(MVP\)

Guest Pegasus \(MVP\)

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

 

"Donald Campbell" <Donald@suedon.co.uk> wrote in message

news:vZmfzrLlTewHFAT$@suedonltd.demon.co.uk...

> In article <#l$d4bxdIHA.1824@TK2MSFTNGP02.phx.gbl>, "Pegasus (MVP)"

> <I.can@fly.com.oz> writes

>>

>>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>>news:T8pAKILbnbwHFAGO@suedonltd.demon.co.uk...

>>> In article <#ONzmKxdIHA.4144@TK2MSFTNGP05.phx.gbl>, "Pegasus (MVP)"

>>> <I.can@fly.com.oz> writes

>>>>

>>>>"Donald Campbell" <Donald@suedon.co.uk> wrote in message

>>>>news:IcdGCdIJJbwHFAG5@suedonltd.demon.co.uk...

>>>>>

>>>>> Backing up to DDS tape.

>>>>>

>>>>> Compression is enabled on the drive, but when NTBackup runs it only

>>>>> puts

>>>>> on the native amount before asking for a second tape.

>>>>>

>>>>> NTBackup is told to use compression if possible.

>>>>>

>>>>> Any ideas (apart from don't use NTBackup).

>>>>>

>>>>>

>>>>> Don

>>>>>

>>>>

>>>>The key is in the phrase "use compression if possible". I suspect

>>>>that your backup drive does NOT offer hardware compression.

>>>>Many manufacturers state a tape capacity of 20/40 GBytes

>>>>(uncompressed/compressed) (for example) but fail to state that

>>>>this refers to ***software*** compression. I consider this

>>>>misleading.

>>>>

>>>>In other words, unless your tape drive has inbuilt hardware

>>>>compression, you're stuck with the lower capacity figure.

>>>>

>>>>

>>>

>>>

>>> Looking at the Windows "hardware" set-up the driver for the tape states

>>> "compression enabled".

>>>

>>> HP diagnostics indicates that the drive is fine.

>>>

>>>

>>> Don

>>>

>>

>>Rather than relying on what the driver says, I would check the

>>manufacturer's data sheet.

>>

>>

>

> Diagnostics says that it can and the spec says that it does.

>

> Don

 

In this case I would do this:

1. Post the exact ntbackup command line here so that someone

can confirm that hardware compression is turned on.

2. Armed with this confirmation, complain to HP.

Guest Andrew Morton

Guest Andrew Morton

Posted
Posted

Re: Server 2003 - NTBackup not compressing files to tape

 

Donald Campbell wrote:

> Backing up to DDS tape.

>

> Compression is enabled on the drive, but when NTBackup runs it only

> puts on the native amount before asking for a second tape.

>

> NTBackup is told to use compression if possible.

>

> Any ideas (apart from don't use NTBackup).

 

It might be that the data you're backing up isn't compressible, for example

zip or jpg files.

 

Andrew

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