Question on the disk vs tape speed.  When you say the tape equals disk,
does this also include recovery time.  I've noticed disk is incomparable in
recovery versus tape especially when you go to more then 1 tape, maybe
because I live in the bottom SCSI world.  Thanx

Thank You,
Bill Rosette
Data Center/IS/Papa Johns International
WWJD


                                                                                
                                                     
                      Daniel Sparrman                                           
                                                     
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Allen,

we have disk performing up to 280MB/s over 2 FC HBA against a FAStT900.
You know the amount of tape drives you would need to match that speed? I'd
say about 4-5 LTO-2 tape drives.....

No problems matching disk speed against tape speed. Only a matter of
budget :)

But I do agree with you in your basic opinion. If you've got a limited
budget, a single LTO-2 drive is normally faster than running against
internal SCSI-disks or S-ATA disks.

Best Regards

Daniel Sparrman
-----------------------------------
Daniel Sparrman
CIO
Exist i Stockholm AB
Propellervägen 6B
183 62 TÄBY
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51



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Subject
Re: Backup options






==> In article <OF4F01CECE.433776B6-ON85256F46.005486D5 AT papajohns DOT com>,
William Rosette <Bill_Rosette AT PAPAJOHNS DOT COM> writes:



> It is currently running at 55.945 GB per hour going to tape (1 tape
drive
> (collocate)), pretty good for tape drive speed.  Disk would make the
backup
> run faster with multi-streams.  Cannot go to multi-tapes due to slow
> recovery.  Other option would be to break the backup into 2 separate
backups
> running simultaneously, probably nightmare admistrativewise.

Say more about "slow recovery" when you do mulitple sessions to tapes?

If you've got the disk to sustain the backup, that will help, but I've not
yet
seen a disk solution that measures up to the tape speeds.


 - Allen S. Rout