Ocfs users - Mar 2004 - RHEL 3 and OCFS 1.0.9-12 / 1.0.11-1

Is the following statement still valid for either OCFS 1.0.9-12 or OCFS
1.0.11-1? 
The following is from one of the questions put forward by Derek Suzuki on
Ocfs-users
"A couple more minor questions about OCFS and RHEL3"
> Next, I saw a Metalink thread which suggests that async I/O is not >
supported on OCFS with RHAS 2.1. It doesn't say anything about RHEL3. >
We've been using async in our testing with no problems so far, and plan to
>
use it in production unless Oracle feels the combination is not yet >
trustworthy. 

well - tough one, it works, but the big issue is that you rredologfile need
to be contiguous on disk, otherwise you might have failures, exact same goes
for rhel3 as rhas21.
 you can see that by running debugocfs 
eg : /ocfs/log/foo1.dbf -> debugocfs -f /log/foo1.dbf /dev/sdXXX that will
show how many offsets (should only have one) in the extents if its more than
1, dd it over with a very large blocksize and see if that ends up being 1
contig file. if you do that, everything should work, however, there just
hasn't been enough real testing with aio, need to ggather more evidence. the
reason the logfiles are annoying is because he way aio is implemented and
how we call it, it cannto handle short io's or non contig aio submits. 


____________
Baqir Hussain
Database Administrator
zipRealty Inc.
(510)735-2696

Same holds for RHEL3. The underlying kernel issue has been
address in 2.6. Both AS21 and EL3 are 2.4 based.

Baqir Hussain wrote:
>Is the following statement still valid for either OCFS 1.0.9-12 or OCFS
>1.0.11-1? 
>The following is from one of the questions put forward by Derek Suzuki on
>Ocfs-users
>"A couple more minor questions about OCFS and RHEL3"
>
>  
>
>>Next, I saw a Metalink thread which suggests that async I/O is not >
>>    
>>
>supported on OCFS with RHAS 2.1. It doesn't say anything about RHEL3.
>
>We've been using async in our testing with no problems so far, and plan
to >
>use it in production unless Oracle feels the combination is not yet >
>trustworthy. 
>
>well - tough one, it works, but the big issue is that you rredologfile need
>to be contiguous on disk, otherwise you might have failures, exact same goes
>for rhel3 as rhas21.
> you can see that by running debugocfs 
>eg : /ocfs/log/foo1.dbf -> debugocfs -f /log/foo1.dbf /dev/sdXXX that
will
>show how many offsets (should only have one) in the extents if its more than
>1, dd it over with a very large blocksize and see if that ends up being 1
>contig file. if you do that, everything should work, however, there just
>hasn't been enough real testing with aio, need to ggather more evidence.
the
>reason the logfiles are annoying is because he way aio is implemented and
>how we call it, it cannto handle short io's or non contig aio submits. 
>
>
>____________
>Baqir Hussain
>Database Administrator
>zipRealty Inc.
>(510)735-2696
>
>_______________________________________________
>Ocfs-users mailing list
>Ocfs-users@oss.oracle.com
>http://oss.oracle.com/mailman/listinfo/ocfs-users
>  
>