AIX使用过程中，发现无法创建大小超过1G的单个文件：
# dd if=/dev/zero of=large_file bs=1024 count=2000000 dd: 0511-065 Requested a write of 1024 bytes, but wrote only 512. # ls -l large_file -rw-r--r-- 1 root system 1073741312 Jun 01 13:57 large_file
经过查证，JFS2本身支持文件系统大小是TB级的，所以这个并不是文件系统的限制。
Maximum JFS2 file system size: 32TB Maximum JFS2 file size: 16TB Minimum JFS2 file system size: 16MB
这个单个文件最大1G的限制来自ulimit中，查看设置如下：
# ulimit -a core file size (blocks, -c) 1048575 data seg size (kbytes, -d) 131072 file size (blocks, -f) 1048575 max memory size (kbytes, -m) 32768 open files (-n) 2000 pipe size (512 bytes, -p) 64 stack size (kbytes, -s) 32768 cpu time (seconds, -t) unlimited max user processes (-u) 262144 virtual memory (kbytes, -v) unlimited -bash-3.2# exit
编辑ulimit默认配置文件/etc/security/limits，找到如下设置：
default: fsize = 2097151
将文件最大尺寸限制更改为无限制，如下：
default: fsize = -1
登出用户后，重新登录，再次查看文件大小限制：
# ulimit -a core file size (blocks, -c) 1048575 data seg size (kbytes, -d) 131072 file size (blocks, -f) unlimited max memory size (kbytes, -m) 32768 open files (-n) 2000 pipe size (512 bytes, -p) 64 stack size (kbytes, -s) 32768 cpu time (seconds, -t) unlimited max user processes (-u) 262144 virtual memory (kbytes, -v) unlimited
再次创建2G大小的文件成功。
# dd if=/dev/zero of=large_file bs=1024 count=2000000 2000000+0 records in. 2000000+0 records out. # ls -l large_file -rw-r--r-- 1 root system 2048000000 Jun 01 14:28 large_fileShare on Twitter Share on Facebook
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