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Full Discussion: /proc is eating my disk man
Top Forums UNIX for Dummies Questions & Answers /proc is eating my disk man Post 34025 by Perderabo on Thursday 30th of January 2003 01:26:44 PM
Old 01-30-2003
/proc is a seperate filesystem. Just like /usr ot /var is a seperate filesystem. /var is a mount point. Do a "du -sk /var/*". I'll bet that you find some files there. Do you understand that the files in /var have no bearing at all in the space consumed in root? /proc is the same way. It is a mount point. What's more the filesystem that is mounted there is not real. If you can't grasp that, just ignore it. You don't look in /var for files to delete when root is full do you? Well don't look in /proc either. Or /usr. Or /tmp. And so on. You need to find files in root to delete. Removing a file from /var does not return space to the root fileststem. Neither would /proc.

If you want more space in your root filesystem, you must delete some files that reside there. Deleing files in other filesystems won't help. The space in root is consumed by files that reside in root. When a file resides somewhere else it doen't eat up space in root.

As for how it works, type:
df -n / /proc
and you can see the filesystem type. When you open a file on / the open system call see that / is a ufs filesystem. So it calls the ufs code to open the file. The ufs code really does read a disk somewhere to get its info. On the other hand, when you open a file in /proc, the open system call sees that the file is in a proc filesystem so it calls the proc code. The proc code scans the currently running processes instead of reading a physical disk. And the read, stat, and write system calls do the same thing. This is called the filesystem switch. It was first used to put nfs into the kernel.
 

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LEARN ABOUT PHP

quotacheck

quotacheck(1M)						  System Administration Commands					    quotacheck(1M)

NAME

       quotacheck - ufs file system quota consistency checker

SYNOPSIS

       quotacheck [-fp] [-v] filesystem...

       quotacheck -a [-fpv]

DESCRIPTION

       quotacheck  examines  each  mounted  ufs file system, builds a table of current disk usage, and compares this table against the information
       stored in the file system's disk quota file. If any inconsistencies are detected, both the quota file and the current system  copy  of  the
       incorrect quotas are updated.

       filesystem is either a file system mount point or the block device  on which the file system resides.

       quotacheck  expects  each file system to be checked to have a quota file named quotas in the root directory. If none is present, quotacheck
       will not check the file system.

       quotacheck accesses the character special device in calculating the actual disk usage for each  user.  Thus,  the  file	systems  that  are
       checked should be quiescent while quotacheck is running.

OPTIONS

       The following options are supported:

       -a	Check the file systems which /etc/mnttab indicates are ufs file systems.  These file systems must be read-write mounted  with disk
		quotas enabled, and have an rq entry in the mntopts field in /etc/vfstab.

       -f	Force check on file systems with logging enabled. Use in combination with the -p option.

       -p	Check quotas of file systems in parallel. For file systems with logging enabled, no check is performed unless  the  -f	option	is
		also specified.

       -v	Indicate the calculated disk quotas for each user on a particular file system. quotacheck normally reports only those quotas modi-
		fied.

USAGE

       See largefile(5) for the description of the behavior of quotacheck when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /etc/mnttab     Mounted file systems

       /etc/vfstab     List of default parameters for each file system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       edquota(1M), quota(1M), quotaon(1M), repquota(1M), attributes(5), largefile(5), quotactl(7I), mount_ufs(1M)

SunOS 5.10							    31 Jul 1998 						    quotacheck(1M)
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