[CentOS] Tape drive throughput

Rodrigo Barbosa rodrigob at darkover.org
Fri Jun 9 21:43:12 UTC 2006


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On Fri, Jun 09, 2006 at 04:28:38PM -0500, Steve wrote:
> >Maybe you should take your time to read the manpage for "mt".
> >Also, check the "blocksize" configuration for your tape drive.
> >
> >I'm not talking about cpio -C or dump -b or tar -b. I'm talking
> >about "mt setblk" and "blocksize" for stinit.
> I'm quite familiar with mt's man page.   I use 'setblk 0' for my 
> clients' backups... but for compatibility reasons, not for performance 
> ones.  (Most OSes know about variable block size, BTW.  Even SCO Open 
> Server.) I see no reason to turn Bowie's simple question into a "this is 
> really complicated" answer when it's not.

Yes, this IS a complicated question. Not because it is "technicaly
complicatd" but because "many factors affect it".

If you use "setblk 0", you are using "Variable Blocksize". Which
just makes it more complicated to calculate the throughput, since
there is no way for you to know what block size will be under use
in a given moment.

But I'll give you the benefit of the doubt. Since you say it is not
a complicated issue, please give us the throughput he is getting
for this DLT Unit.

- -- 
Rodrigo Barbosa
"Quid quid Latine dictum sit, altum viditur"
"Be excellent to each other ..." - Bill & Ted (Wyld Stallyns)

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