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