[TriLUG] Slower Tape Backup After Upgrade

[Jeremy Portzer]

On Thu, 2004-09-30 at 16:03, Paul D. Boyle wrote:
> Hi All,
> 
> As I have mentioned previously on this list, I recently upgraded my SuSE
> 7.3 box to SuSE 9.1 (this is a SCSI box).  I have a backup script which
> runs 3x a week and write the data to tape drive.  Before the upgrade
> the back up would archive about 8GB in about 75-80 minutes.  After the
> upgrade the same back up (actually, less data because I cleared out
> about 2GB of "stuff") takes 9 *hours*.  Here are excerpts from 'dmesg'
> which give the make and model of the scsi adapter and tape drive:
> 
> scsi0 : Adaptec AIC7XXX EISA/VLB/PCI SCSI HBA DRIVER, Rev 6.2.36
>         <Adaptec aic7890/91 Ultra2 SCSI adapter>
>         aic7890/91: Ultra2 Wide Channel A, SCSI Id=7, 32/253 SCBs
> 
> (scsi0:A:6): 10.000MB/s transfers (10.000MHz, offset 15)
>   Vendor: ARCHIVE   Model: Python 04106-XXX  Rev: 735B
>   Type:   Sequential-Access                  ANSI SCSI revision: 02
> 
> Kernel is stock (latest updated) SuSE 9.1 (ver 2.6.5-7.108).
> 
> Also, FYI, I am using 'cpio -o -L -Hcrc' the heart of the backup script.
> 
> Anyone have any ideas as to why this is happening, or what can be done 
> about it?
> 

A long shot, but you say this is a "scsi system" -- is the hard drive
scsi also?  If not, and the hard drive is IDE, you should check to be
sure DMA is enabled.  Run, for example, "hdparm -d /dev/hda" to see if
it's enabled on hda1.  If not, try enabling it (hdparm -d 1 /dev/hda)
and see if that changes things.

That's all I can think of; there's probably a better idea...

Jeremy

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