[rhn-users] Backup problem using DLT Tape Drive in LINUX

[Ramesh R]

Hi,
  Thanks Jim for the prompt feedback and I will try out redirecting to
/dev/null device.But still I cannot understand why it should take 18 hrs
for backing 63GB data.

Regards
Ramesh.R 

-----Original Message-----
From: rhn-users-bounces at redhat.com [mailto:rhn-users-bounces at redhat.com]
On Behalf Of Trice, Jim
Sent: Monday, June 20, 2005 10:56 PM
To: Red Hat Network Users List
Subject: RE: [rhn-users] Backup problem using DLT Tape Drive in LINUX


Hi,
     If you are planning on using dump for your backups you should
reconsider. I may be a little out of date but linux dump was not
recommended the last time I looked. I would recommend using cpio or tar
for simple backups.
     I would try to determine if it is the disk access of tape access
giving problems. Have you tried backing up to /dev/null. You could also
benchmark your disk systems using something like iozone (google it). 
     
Jim T.
> -----Original Message-----
> From: rhn-users-bounces at redhat.com 
> [mailto:rhn-users-bounces at redhat.com] On
Behalf Of Ramesh R
> Sent: Monday, June 20, 2005 1:59 AM
> To: rhn-users at redhat.com
> Subject: [rhn-users] Backup problem using DLT Tape Drive in LINUX
> 
> Hi,
>    Iam from India and we have installed Linux ES Verion 3 on DELL 
> SERVER POWEREDGE 2850 series which has following configuration: Dual 
> Processor with 4 GB RAM ad 4 * 72 GB SCSI Hard disk Drives With RAID 
> 10 technology. We have implemented Oracle Applications ERP . We have a

> peculiar problem for backing up  our data. We have connected DLT Tape 
> Drive VS80 40/80GB ( Tandberg)  capacity with SCSI Adaptec Card. When 
> we initiate backup command as follows:
>     dump of /dev/st0 /data/erpp where /dev/st0 denotes the device for 
> tape drive and /data/erpp is the partition in which oracle apps has 
> been installed. The timing for backing up 63GB data and files , it 
> takes 18 hours for completion. We had replaced the SCSI adaptec card ,

> Tape Drive and cable but still it gives same timing.
> The same process we had tried from a desktop by applying latest SCSI 
> drivers  and initiated the backup , it took 12 minutes for 2 GB of
data.
> We had applied latest driver for Linux but still it shows the same 
> timing. I need to know any other parameters needs to be configured 
> under Linux. I need help more urgently as we are going online by next
week.
> 
> Regards
> Rames.R
> 
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