Hi David,
I am using NFSv3. Sorry, should have said that!
-Dougal
On Fri, Dec 10, 2010 at 2:06 PM, David Sommerseth
<dazo@xxxxxxxxxxxxxxxxxxxxx> wrote:
> On 10/12/10 18:23, Dougal Ballantyne wrote:
>> Dear CentOS,
>>
>> I have recently upgraded several servers from CentOS4 to CentOS5 and I am
>> noticing a strange change to the stat() call. I have written a very
>> small program to test and show the behavior. I am calling stat()
>> against a file which is exported from my NAS and mounted with 32k
>> read/write sizes.
>>
>> [dougalb@centos4 tmp]$ cat my_stat.c
>> #include<unistd.h>
>> #include<stdio.h>
>> #include<sys/stat.h>
>> #include<sys/types.h>
>>
>> int main(int argc, char **argv)
>> {
>> if(argc != 2)
>> return 1;
>>
>> struct stat fileStat;
>> if(stat(argv[1],&fileStat)< 0)
>> return 1;
>>
>> printf("Block size: \t\t%d\n",fileStat.st_blksize);
>>
>> return 0;
>> }
>>
>> [dougalb@centos4 tmp]$
>> [dougalb@centos4 tmp]$ gcc -o my_stat.exe my_stat.c
>> [dougalb@centos4 tmp]$
>> [dougalb@centos4 tmp]$ ./my_stat.exe /mnt/nas/testfile
>> Block size: 32768
>> [dougalb@centos4 tmp]$
>> [dougalb@centos4 tmp]$ cat /etc/redhat-release
>> CentOS release 4.7 (Final)
>> [dougalb@centos4 tmp]$
>>
>> [dougalb@centos5 tmp]$ ./my_stat.exe /mnt/nas/testfile
>> Block size: 4096
>> [dougalb@centos5 tmp]$
>> [dougalb@centos5 tmp]$ cat /etc/redhat-release
>> CentOS release 5.5 (Final)
>> [dougalb@centos5 tmp]$
>>
>> On CentOS5 it is reporting 4k block sizes when it should report 32k. Has
>> anyone seen this or aware of what is causing this change in behavior?
>
> What kind of network file system is used to mount your NAS?
>
>
> kind regards,
>
> David Sommerseth
>
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