Re: 3581 Tape Device

[Pat Barber <mboceanside@xxxxxxxxxxxxxxxx>]

No sense guessing...

http://www-306.ibm.com/common/ssi/OIX.wss?DocURL=http://d03xhttpcl001g.boulder.ibm.com/common/ssi/rep_sm/4/897/ENUS3581-_h04/index.html&InfoType=DD&InfoSubType=SM&InfoDesc=HW+%26+SW+Desc+%28Sales+Manual%2C+RPQ%29&panelurl=OIX.wss%3Fbuttonpressed%3DDET001PT116%26page%3D1000%26paneltext1%3DDET001PEF012%26user%2Btype%3DEXT&paneltext=HW%20&%20SW%20desc%20(Sales%20manual,%20RPQ)

David Charmatz wrote:
> We currently have a 3580-2 (3581-L23) Ultrium2 LTO tape device. I am running
> several of backup commands to see which will give us the best performance.  
>
>  
>
> I'm trying to figure out a few things regarding its performance.  
>
>  
>
> 1)      Unless I'm mistaken, doesn't the 3581 tape drive have built in
> hardware compression?
>
> 2)      If it does have hardware compression, shouldn't it write an Ultrium2
> tape to at the maximum 400 GB?
>
> 3)      How can I verify the hardware compression is on?  (Nothing in
> Service, Setup, Operator Guide - there was a previous posting suggesting
> pins in the back of the unit, however, I am unable to locate them or
> documentation referring to them)
>
> 4)      I ran a SAVLIB LIB(TSTDTA) DEV(TAP01) DTACPR(*DEV).  When I run a
> DSPTAP DEV(TAP01) DATA(*SAVRST), I see the following: Data Compressed: No
>
> I can run SAVLIB LIB(TSTDTA) DEV(TAP01) DTACPR(*YES) and still get: Data
> Compressed: No
>
> 5)      I ran a PRTERRLOG TYPE(*VOLSTAT) VOLTYPE(3580) VOL(TST001).  Under
> ---M Bytes--- Section, I get 1 Read and 51764 written.  I'm assuming that
> means that it wrote 51764 MB?  The library itself only contained 156 MB.
> Any ideas on this?
>
>  
>
>  
>
> Thanks,
>
>  
>
> David Charmatz
>
>