磁盘空间释放不料怎么办?

nkliyong

过一段时间磁盘空间的一个分区就满了,
用du看其实该分区不大,机器重启后空间
就回来了,怎么知道是哪儿程序在占用空间
没释放???
谢谢

大猫

可能是sparse file，df -k应能看到fs在涨
在该fs的mount dir下， ls -l 可看到file在涨。
如目录较深，可
ls -lR >;list.1
ls -lR >;list.2
diff list.1 list.2

nkliyong

大猫:
何谓sparse file?

lljj

可能有什么进程在写错误日志！还有进程没有关掉！空间也没有释放！

nkliyong

df看它一直都不涨
但某天不看,它可能会突然涨起来
另:为什么用du看整个fs不大呢?

大猫

Some applications, particularly databases, maintain data in sparse files. Files that do not have disk blocks allocated for each logical block are called sparse files. If the file offsets are greater than 4 MB, then a large disk block of 128 KB is allocated. Applications using sparse files larger than 4 MB may require more disk blocks in a file system enabled for large files than in a regular file system.
In the case of sparse files, the output of ls command is not  owing the actual files size, but is reporting the number of bytes between the first and last blocks allocated to the file, as shown in the following example:
# ls -l /tmp/"sparsefile  name"
-rw-r--r-- 1 root system 100000000 Jul 16 20:57 /tmp/sparsefile
The du command can be used to see the actual allocation, since it reports the
blocks actually allocated and in use by the file. Use du -rs to report the
number of allocated blocks on disk.
# du -rs /tmp/sparsefile
256 /tmp/sparsefile