#9623 NORM 1.5-F11: test/fix disk full behaviour

[Zarro Boogs per Child]

#9623: test/fix disk full behaviour
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           Reporter:  dsd        |       Owner:  dsd          
               Type:  defect     |      Status:  new          
           Priority:  normal     |   Milestone:  1.5-F11      
          Component:  distro     |     Version:  not specified
         Resolution:             |    Keywords:               
        Next_action:  reproduce  |    Verified:  0            
Deployment_affected:             |   Blockedby:               
           Blocking:             |  
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Comment(by Quozl):

 Did some more testing.  Conclusions:
  * filling disk as user may cause a long reboot delay, but otherwise is a
 recoverable situation,
  * ext3 write rate is much lower than read rate,
  * ext3 fsck on full disk takes almost three minutes.

 On os34 as olpc:
  * ''time (dd if=/dev/zero of=big bs=1024; sync)''
  * total data written 2403237888 (2.4Gb),
  * total running time 12min 57sec,
  * calculated data rate 2.9MByte/sec,
  * reading back the file took 2min 21sec, or 16.25MByte/sec,
  * Ctrl-Alt-Erase and X server restarts successfully, Sugar prompts with
 "Your Journal is full" and Terminal can be started,
  * forced power cycle, results in hang in boot animation, didn't diagnose
 further.

 On os36 as olpc:
  * same use of ''dd'',
  * total data written 2321461248 (2.3Gb),
  * total running time 12min 38 sec,
  * Ctrl-Alt-Erase and X server restarts repeatedly,
  * forced power cycle, results in hang in boot animation, single dot,
 repeating using tick key on boot ... the last line logged shows it hung
 doing an ext3 fsck ... dmesg showed it took 296 seconds to fsck, then the
 system operated normally,
  * a normal reboot results in the DISKFULL warning, the deletion of
 several activities, and the Journal Full warning.

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Ticket URL: <http://dev.laptop.org/ticket/9623#comment:4>
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