st0

[Alexios Chouchoulas]

On Fri, 2 Mar 2001, George Daflidis-Kotsis wrote:

> On Fri, Mar 02, 2001 at 10:30:16AM +0000, Alexios Chouchoulas wrote:
> 
> > On Fri, 2 Mar 2001, I.Ioannou wrote:
> > 
> > > On 01-Mar-01 Mavrelos, Antonios wrote:
> > > > Κάνοντας ένα tar cvzf /dev/st0 /source_files χτύπησε το ακόλουθο
> > >               ^^^^^^^^^^
> > > eisai sigouros gia to z ?
> > 
> >   Isws na einai poly nwris to prwi gia na mporw na skeftw logika, alla ti
> > problhma mporei na exei to z (=enable compression);
> 
> Apo to tar(1):
> 
>      -z
>      --gzip
>      --gunzip                Filter the archive through gzip(1).
> 
> De nomizw pws gia na sumpieseis ta blocks enos tape na xrhsimopoieis
> to gzip(1).

  Ontws, alla gia na sympieseis to  backup sou s'ena tape pou den exei
hardware compression aftos einai o monos tropos. :-) Emena mou doulevei mia
xara. Fysika de sympiezei ta blocks alla ta arxeia. Alla to teliko
apotelesma einai idio (an oxi kalytero): se mia tainia xwrane perissotera
dedomena. Kapou diabaza sto WWW oti polloi exoun kalytera apotelesmata
sympiezontas ta backups prin ta steiloun sto drive, xwris hardware
compression (otan yparxei [1]).


[1]  Kanena apo ta tapes mou ws twra den eixan hardware compression (diafora
     Shugart-based QIC-40/80, QIC-24 me to diko tou prwtokolo bidwmeno panw
     se plaketa SCSI converter, SCSI-based QIC-24 kai SCSI based TR-4) den
     yposthrizan hardware sympiesh.

     Alla nomizw oti to gzip kanei kalyterh sympiesh apo to hardware enos
     tape. To mono pou xaneis einai taxythta (otan kaneis online software
     compression). An o host adapter einai argos h o host einai argos, afto
     einai kako giati mporei na xaseis to streaming kathws to tape kanei
     synexeia repositioning gia na ksanabrei th thesh tou. Se polla SCSI
     tapes afto einai problhma. Px to IBM/Seagate/Archive TR-4 mou thelei
     toulaxiston panw-katw .75-1M/s sustained throughput alliws kanei
     repositioning. Kai parapanw thorybo. Kai zestainetai ki allo. Klp klp.

A.

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