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 at 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 at centos4 tmp]$ > [dougalb at centos4 tmp]$ gcc -o my_stat.exe my_stat.c > [dougalb at centos4 tmp]$ > [dougalb at centos4 tmp]$ ./my_stat.exe /mnt/nas/testfile > Block size: 32768 > [dougalb at centos4 tmp]$ > [dougalb at centos4 tmp]$ cat /etc/redhat-release > CentOS release 4.7 (Final) > [dougalb at centos4 tmp]$ > > [dougalb at centos5 tmp]$ ./my_stat.exe /mnt/nas/testfile > Block size: 4096 > [dougalb at centos5 tmp]$ > [dougalb at centos5 tmp]$ cat /etc/redhat-release > CentOS release 5.5 (Final) > [dougalb at 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