[ale] strange issue with disc space

[Jeff Lightner]

Oracle allows use of either raw devices or cooked filesystems.  There is
no requirement to use raw though many choose to do so even in "UNIX on
RISC" as I know because I've used filesystems both on SPARC and PA-RISC
for Oracle.

With RAC on Linux it gets a little more complicated.  You can do "raw"
on Oracle ASM or "cooked" on OCFS/OCFS2 for RAC databases.   The "raw"
is deprecated in Linux.  It is still there "for now" but may go away in
future kernel releases in favor or DIRECT_IO which is what OCFS/OCFS2
uses.  

Oracle's documents for CRS/RAC recommended ASM on raw because they were
updated for RHEL4 (and Suse and OEL equivalents) but not RHEL5.  RHEL5
still allows for raw but as I said I found out it was deprecated
(unfortunately only AFTER I'd used ASM and raw).  The OCFS2 documents
talk about the deprecation and I later found Linux documentation
discussing the same thing.   If I ever need to build another RAC system
on Linux I'll go the OCFS2 route.

-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
Stephen R. Blevins
Sent: Thursday, July 30, 2009 2:18 PM
To: Atlanta Linux Enthusiasts - Yes! We run Linux!
Subject: Re: [ale] strange issue with disc space

Your DB reported this?  What DBMS are you using?  Does it support "raw 
partitions," as ORACLE does.  In my previous experience in the "UNIX on 
RISC" world, the du command only reported data written through the file 
system. YMMV

Stephen R. Blevins
srblevi at worldnet.att.net


Chuck Payne wrote:
> Guys,
> 
> I have a question. Have you ever seen disc space just disappear and
> you were unable to find what is using? One of our DB came to me the
> other day pointed out that one of his rac boxes has filled up
> 
>                       2.0G  1.7G  214M  89% /
>                       2.0G   88M  1.8G   5% /tmp
>                      1023M  298M  673M  31% /opt
>                       2.0G  203M  1.7G  11% /home
>                       2.0G  297M  1.6G  16% /archive
>                       2.0G  456M  1.4G  25% /var
>                       4.9G  2.7G  2.0G  59% /usr
>                       2.0G   68M  1.8G   4% /usr/local
>                        40G   12G   26G  32% /u00
>                      122M   32M   84M  28% /boot
>                      7.9G     0  7.9G   0% /dev/shm
> 	             4.0G  118M  3.9G   3% /crs_db
> 
> so I started looking into,  but I can't find any file or dir on the
> root partition that eat space. I have  looked at dmesg and don't see
> anything. Oh, we have rebooted the box and the space didn't clear up.
> 
> 
> Just an fyi, here are things I did look, please feel free to let me
> know what other things I need to check.
> 
> alias ducks='du -chs * | sort -rn | head -11'
> find / -type f -size +20000k -exec ls -lh {} \; 2> /dev/null | awk '{
> print $NF ": " $5 }'  | sort -nrk 2,2
> lsof -a +L1
> 
> 

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