Hello,

See below ...



On 06/02/2017 01:44 PM, Richard Fox wrote:

Hi,

On Fri, Jun 02, 2017 at 01:24:46PM +0200, Kern Sibbald wrote:

I don't seem to have the original post of Richard Fox, so could you please
specify what "this directive" is in the sentence:

Otherwise, this advice is a little contradictory to the documentation which states 
"On most modern tape drives, you will not need to specify this directive.

My apologies, I had sent the message from the wrong address and
cancelled moderation on it. I was hoping nobody would notice.

My original message asked if this discussion was in regard to the
"Maximum block size" (and presumably "Minimum block size") from the
device resource.

"Are you both referring to "Maximum block size" (and presumably "Minimum block 
size") from the
Device resource?

As for me: Yes.

If not please ignore the rest of this message. Otherwise, this advice is a 
little contradictory
to the documentation which states "On most modern tape drives, you will not 
need to specify this
directive.".

More importantly however, the documentation (for Bacula 7.2 anyways) says: "The 
maximum
size-in-bytes possible is 2,000,000." which contradicts the assertion that 
these can be specified
as 2MB which is not the same thing. Is the documentation inaccurate on
this subject?"

Best regards,
Kern

On 06/01/2017 02:51 PM, Cejka Rudolf wrote:

Richard Fox wrote (2017/06/01):

Otherwise, this advice is a little contradictory to the documentation which states 
"On most modern tape drives, you will not need to specify this directive.".

Given that Linux with LTO-X tape drive is probably a majority system here (not 
counting
configurations without tape drives), the statement is slightly misleading. I'm 
convinced
that it is really not needed because of tape drive, server nor HBA, but it 
seems that it
is really needed because of Linux. However it is not a real problem, because 
Linux allows
to increase the block size "naturally", with the exception that you have 
limiting HBA.

More importantly however, the documentation (for Bacula 7.2 anyways) says: "The 
maximum size-in-bytes possible is 2,000,000." which contradicts the assertion that 
these can be specified as 2MB which is not the same thing. Is the documentation 
inaccurate on this subject?

I wrote 2 MB as a general recommendation over various manufacturers and software
developers, with non-written suggested value 256 KB or 512 KB as max., so please
take my 2 MB limit just loosely :o)

Thanks,
Rich.

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