softraid + serverraid locking FS

softraid + serverraid locking FS

[elmer]

 cp -dpR lotsfiles2GB /testcopy

                    SMP x335   UP x335
serverraid-serverraid  OK          OK
softraid-softraid      OK          OK
softraid-serverraid    OK          OK
serverraid5E-softraid  SLEEPY
serverraid1E-softraid                PROBLEM

it is redhat AS 2.4.9-25 kernel, SMP kernel for both.

PROBLEM:
  some general FS lock is accuired probably.
  ps axl and top and ls take up to 10-30 seconds to execute
  once heartbeat+softdog got its minute and flushed the whole box

Both computers are identical except one has 1 cpu, oter 2 cpu
2GB memory, bigpages=2100

softraid is raid1, discbox is EXP300, serverraid is 4M
/ is on softraid, sometimes "more /proc/mdstat" gets waiting at last row
for a while.

Re: softraid + serverraid locking FS

[Arjan van de Ven]

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On Wed, 2003-09-10 at 10:52, elmer@linking.ee wrote:
>  cp -dpR lotsfiles2GB /testcopy
> 
>                     SMP x335   UP x335
> serverraid-serverraid  OK          OK
> softraid-softraid      OK          OK
> softraid-serverraid    OK          OK
> serverraid5E-softraid  SLEEPY
> serverraid1E-softraid                PROBLEM
> 
> it is redhat AS 2.4.9-25 kernel, SMP kernel for both.

that kernel is very old and heavily patched; lkml is not the place to
report problems, your Red Hat support contact is...

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Re: softraid + serverraid locking FS

[elmer]

the same problem with vanilla 2.4.22 (SMP kernel on UP hw)

for example, after startup:

1. cp -dpR lotsfiles4GB /testcopy
2. load goes with minutes to 13
3. /bin/sync  blocks
4. Ctrl-Z to cp
5. ps axlef waits 3-10 secs before answer as raid1 sync goes with 14kB/sec

previous problem was without raid sync, currently just it takes time to
test without it
NB! the same copy from the same softraid partition to the same softraid
partition sucks a bit, but load does not grow steadily, remains 3changing raid1sync speed affects a bit the whole thing, but does not end it.

the same copy within serverraid partition is ok.

Currently I havent managed to get softdog into action, but behaviour is
still bad enough to call it a BUG.




> On Wed, 2003-09-10 at 10:52, elmer@linking.ee wrote:
>>  cp -dpR lotsfiles2GB /testcopy
>>
>>                     SMP x335   UP x335
>> serverraid-serverraid  OK          OK
>> softraid-softraid      OK          OK
>> softraid-serverraid    OK          OK
>> serverraid5E-softraid  SLEEPY       X
>> serverraid1E-softraid     X       PROBLEM
>>
>> it is redhat AS 2.4.9-25 kernel, SMP kernel for both.
>
> that kernel is very old and heavily patched; lkml is not the place to
> report problems, your Red Hat support contact is...