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Date: Sun,  2 Jul 2000 10:25:27 -0700 (PDT)
From: paulo@jetsam.com
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Subject: misc/19646: Level 0 dump takes way longer than it should on 300GB scsi disk
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>Number:         19646
>Category:       misc
>Synopsis:       Level 0 dump takes way longer than it should on 300GB scsi disk
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jul 02 10:30:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Paul Orr
>Release:        3.4 - release
>Organization:
>Environment:
FreeBSD outback 3.4-RELEASE FreeBSD 3.4-RELEASE #0: Mon Dec 20 06:54:39 GMT 1999     jkh@time.cdrom.com:/usr/src/sys/compile/GENERIC  i386

>Description:
Sitting on a Compaq 500Mhz pentium box I have two adaptec 2940UW scsi
cards and one Advansys 3940UW.  The two disks on the 2940UW cards
function without a problem  The 300GB disk (raidv box) on the 3940UW
has difficulty doing a dump.  A level 0 dump of 75GB that should take less than 9 hours takes upwards of 24.  Unlike one of the other disks that takes only 8 or 9 hours.  All disks on the machine are different.

some output...
DUMP: mapping (Pass II) [directories]
  DUMP: estimated 74690022 tape blocks.
  DUMP: dumping (Pass III) [directories]
  DUMP: 0.09% done, finished in 92:27
  DUMP: 0.15% done, finished in 113:28
  DUMP: 0.20% done, finished in 122:14
  DUMP: 0.26% done, finished in 127:50
  DUMP: 0.32% done, finished in 131:22
  DUMP: 0.37% done, finished in 132:52
  DUMP: 0.43% done, finished in 134:17
  DUMP: 0.49% done, finished in 135:12
  DUMP: 0.55% done, finished in 136:01
  DUMP: 0.60% done, finished in 138:56
  DUMP: 0.63% done, finished in 145:10
  DUMP: 0.66% done, finished in 151:25
  DUMP: 0.68% done, finished in 158:02
  DUMP: 0.70% done, finished in 164:27
  DUMP: 0.73% done, finished in 170:39
  DUMP: 0.75% done, finished in 176:36
etc....


>How-To-Repeat:
Do a dump.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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