[Dump-users] Slow after OS upgrade

[Todd a. M. C. <Tod...@ve...>]

CentOS 5 (Red Hat Enterprise Linux clone)
#uname -r
2.6.18-8.1.8.el5

#rpm -qa \*dump\*
dump-0.4b41-2.fc6

Hi All,

Has anyone come across this problem
and how did you fix it?

I am using an LSI Megaraid SATA 150-4 RAID card (/dev/sda).
My motherboard is a Supermicro x7dal-e. I am backing up to
a removable SATA drive (/dev/sdb).

I wiped my CentOS 4.4 and installed CentOS 5. No hardware
changes. Under 4.4 a full backup (dump) took 1:05 hours
(52 GB backup file).  Under 5.0, the same backup takes
3:16 (Note: 43 GB, yes it is smaller).

In general, the system is now very slow.  Windows XP
running under Parallels Virtual Machine is remarkably
more sluggish.

I made the following speed tests in CentOS 5
and from my first CentOS 4.4 boot disk in "rescue"
mode (see below).  I can not see a difference that
would explain this.

Anyone have any ideas?

-T

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#grep -i bogomips /var/log/dmesg
Calibrating delay using timer specific routine.. 4001.91 BogoMIPS 
(lpj=2000959)
Calibrating delay using timer specific routine.. 3999.58 BogoMIPS 
(lpj=1999791)
Total of 2 processors activated (8001.50 BogoMIPS).


#/sbin/hdparm -t /dev/sda
/dev/sda:
  Timing buffered disk reads:  236 MB in  3.01 seconds =  78.53 MB/sec


#/sbin/hdparm -t /dev/sdb
/dev/sdb:
  Timing buffered disk reads:  182 MB in  3.01 seconds =  60.37 MB/sec


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CentOS 4.4 (linux rescue 2.6.9-42.EL):

#cat /proc/cpuinfo
bogomips        : 4002.92

#/sbin/hdparm -t /dev/sda
/dev/sda:
  Timing buffered disk reads:  216 MB in  3.01 seconds =  71.87 MB/sec

#/sbin/hdparm -t /dev/sdb
/dev/sdb:
  Timing buffered disk reads:  184 MB in  3.01 seconds =  61.18 MB/sec