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OCFS and Out Of Memory issue

OCFS and Out Of Memory issue

2005-02-03       - By Frank, Ryan

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Reply:     1     2     3     4     5     6     7     8     9     10     >>  

Hello all!

I am using AS 3.0 update 3 (Kernel 2.4.21-20.Elsmp) on a pair of Compaq
DL-580's with 12gb of RAM.  We are running Oracle 10g release 3, in a
RAC configuration.  I am using SAN storage (Hitachi 9585) via Emulex
LP9002 HBA's.  Cluster file system is provided by OCFS 1.0.13.  

The problem is like this... When I try to create a large file on an OCFS
volume I get the following error from the system when the cached memory
approaches 4GB.  

--BEGIN PASTE--
Feb  3 11:53:54 alvmnrlnx004 kernel: Mem-info:
Feb  3 11:53:54 alvmnrlnx004 kernel: Zone:DMA freepages:  2356 min:
0 low:     0 high:     0
Feb  3 11:53:54 alvmnrlnx004 kernel: Zone:Normal freepages:   617 min:
1279 low:  4544 high:  6304
Feb  3 11:53:54 alvmnrlnx004 kernel: Zone:HighMem freepages:1705708 min:
255 low: 45566 high: 68349
Feb  3 11:53:54 alvmnrlnx004 kernel: Free pages:      1708681 (1705708
HighMem)
Feb  3 11:53:54 alvmnrlnx004 kernel: ( Active: 259469/674762,
inactive_laundry: 101303, inactive_clean: 101243, free: 1708681 )
Feb  3 11:53:54 alvmnrlnx004 kernel:   aa:0 ac:0 id:0 il:0 ic:0 fr:2356
Feb  3 11:53:54 alvmnrlnx004 kernel:   aa:0 ac:340 id:2 il:74 ic:0
fr:617
Feb  3 11:53:54 alvmnrlnx004 kernel:   aa:234326 ac:24803 id:674760
il:101229 ic:101243 fr:1705708
Feb  3 11:53:54 alvmnrlnx004 kernel: 2*4kB 1*8kB 2*16kB 3*32kB 1*64kB
0*128kB 0*256kB 0*512kB 1*1024kB 0*2048kB 2*4096kB = 9424kB)
Feb  3 11:53:54 alvmnrlnx004 kernel: 4*4kB 1*8kB 1*16kB 0*32kB 0*64kB
1*128kB 1*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 2472kB)
Feb  3 11:53:54 alvmnrlnx004 kernel: 0*4kB 0*8kB 1*16kB 1*32kB 0*64kB
1*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 1665*4096kB = 6822832kB)
Feb  3 11:53:54 alvmnrlnx004 kernel: Swap cache: add 0, delete 0, find
0/0, race 0+0
Feb  3 11:53:54 alvmnrlnx004 kernel: 161776 pages of slabcache
Feb  3 11:53:54 alvmnrlnx004 kernel: 502 pages of kernel stacks
Feb  3 11:53:54 alvmnrlnx004 kernel: 0 lowmem pagetables, 7439 highmem
pagetables
Feb  3 11:53:54 alvmnrlnx004 kernel: Free swap:       2097096kB
Feb  3 11:53:54 alvmnrlnx004 kernel: 3145727 pages of RAM
Feb  3 11:53:54 alvmnrlnx004 kernel: 2850807 pages of HIGHMEM
Feb  3 11:53:54 alvmnrlnx004 kernel: 125269 reserved pages
Feb  3 11:53:54 alvmnrlnx004 kernel: 1015244 pages shared
Feb  3 11:53:54 alvmnrlnx004 kernel: 0 pages swap cached
Feb  3 11:53:54 alvmnrlnx004 kernel: Out of Memory: Killed process 4104
(oracle).
--END PASTE--

If I try the same process on an EXT3 volume (Also on the same storage)
it works just great... I found BUG 112891
(https://bugzilla.redhat.com/bugzilla/long_list.cgi?buglist=112891) that
seemed to reference the same issue, the bug is now closed as of kernel
.9.  We are running .20, and still seem to have the problem...

I have tried reformatting the OCFS volumes with different block sizes,
adjusting vm.pagecache values (Set to vm.pagecache = 10 20 30), and
removing all other kernel parameters set for Oracle in /etc/sysctl.conf.
All to no avail... I have opened another case with RedHat, along with a
case with Oracle.

I was wondering if anyone here might be able to shed some light on what
I am doing wrong...

--
-Ryan
Allvac Unix Services
Monroe, NC
(704) 282-1586


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<P><FONT SIZE=2 FACE="Arial">Hello all!</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">I am using AS 3.0 update 3 (Kernel 2.4.21-20.Elsmp
) on a pair of Compaq DL-580's with 12gb of RAM.&nbsp; We are running Oracle 10g
release 3, in a RAC configuration.&nbsp; I am using SAN storage (Hitachi 9585)
via Emulex LP9002 HBA's.&nbsp; Cluster file system is provided by OCFS 1.0.13.
&nbsp; </FONT></P>

<P><FONT SIZE=2 FACE="Arial">The problem is like this&#8230; When I try to
create a large file on an OCFS volume I get the following error from the system
when the cached memory approaches 4GB.&nbsp; </FONT></P>

<P><FONT SIZE=2 FACE="Arial">--BEGIN PASTE--</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Mem
-info:</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Zone
:DMA freepages:&nbsp; 2356 min:&nbsp;&nbsp;&nbsp;&nbsp; 0 low:&nbsp;&nbsp;&nbsp;
&nbsp; 0 high:&nbsp;&nbsp;&nbsp;&nbsp; 0</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Zone
:Normal freepages:&nbsp;&nbsp; 617 min:&nbsp; 1279 low:&nbsp; 4544 high:&nbsp;
6304</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Zone
:HighMem freepages:1705708 min:&nbsp;&nbsp; 255 low: 45566 high: 68349</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Free
pages:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1708681 (1705708 HighMem)</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: (
Active: 259469/674762, inactive_laundry: 101303, inactive_clean: 101243, free:
1708681 )</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel:&nbsp;
&nbsp; aa:0 ac:0 id:0 il:0 ic:0 fr:2356</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel:&nbsp;
&nbsp; aa:0 ac:340 id:2 il:74 ic:0 fr:617</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel:&nbsp;
&nbsp; aa:234326 ac:24803 id:674760 il:101229 ic:101243 fr:1705708</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 2*4kB 1
*8kB 2*16kB 3*32kB 1*64kB 0*128kB 0*256kB 0*512kB 1*1024kB 0*2048kB 2*4096kB =
9424kB)</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 4*4kB 1
*8kB 1*16kB 0*32kB 0*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB =
2472kB)</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 0*4kB 0
*8kB 1*16kB 1*32kB 0*64kB 1*128kB 1*256kB 1*512kB 0*1024kB 1*2048kB 1665*4096kB
= 6822832kB)</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Swap
cache: add 0, delete 0, find 0/0, race 0+0</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 161776
pages of slabcache</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 502
pages of kernel stacks</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 0
lowmem pagetables, 7439 highmem pagetables</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Free
swap:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2097096kB</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 3145727
pages of RAM</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 2850807
pages of HIGHMEM</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 125269
reserved pages</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 1015244
pages shared</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: 0 pages
swap cached</FONT>

<BR><FONT SIZE=2 FACE="Arial">Feb&nbsp; 3 11:53:54 alvmnrlnx004 kernel: Out of
Memory: Killed process 4104 (oracle).</FONT>

<BR><FONT SIZE=2 FACE="Arial">--END PASTE--</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">If I try the same process on an EXT3 volume (Also
on the same storage) it works just great&#8230; I found BUG 112891 (</FONT><A
HREF="https://bugzilla.redhat.com/bugzilla/long_list.cgi?buglist=112891"><U>
<FONT COLOR="#0000FF" SIZE=2 FACE="Arial">https://bugzilla.redhat.com/bugzilla
/long_list.cgi?buglist=112891</FONT></U></A><FONT SIZE=2 FACE="Arial">) that
seemed to reference the same issue, the bug is now closed as of kernel .9.&nbsp
; We are running .20, and still seem to have the problem&#8230; </FONT></P>

<P><FONT SIZE=2 FACE="Arial">I have tried reformatting the OCFS volumes with
different block sizes, adjusting vm.pagecache values (Set to vm.pagecache = 10
20 30), and removing all other kernel parameters set for Oracle in /etc/sysctl
.conf.&nbsp; All to no avail&#8230; I have opened another case with RedHat,
along with a case with Oracle. </FONT></P>

<P><FONT SIZE=2 FACE="Arial">I was wondering if anyone here might be able to
shed some light on what I am doing wrong&#8230; </FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">--</FONT>

<BR><FONT SIZE=2 FACE="Arial">-Ryan</FONT>

<BR><FONT SIZE=2 FACE="Arial">Allvac Unix Services</FONT>

<BR><FONT SIZE=2 FACE="Arial">Monroe, NC</FONT>

<BR><FONT SIZE=2 FACE="Arial">(704) 282-1586</FONT>
</P>

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