05-16-2011
Shared File System Project Feasibility
I would be taking my masters degree project next year. So I am now in the process of thinking something that could help me get more in depth knowledge and will be a useful one in practice.
I have thought about creating shared file system for clustered environments (like GPFS,GFS).
I have below doubts before taking this idea any further.
1. Is it feasible to complete it in one year if I start some home work now ?
2. Is there a way to reuse any code from linux ? (the one from GFS)
3. Any documents to understand the implementation of any existing shared file systems .
4. Best book to start for file system implementations.
Please post your thoughts. That would guide me to choose the better option.
Thanks.
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LEARN ABOUT DEBIAN
gfs_quota
gfs_quota(8) System Manager's Manual gfs_quota(8)
NAME
gfs_quota - Manipulate GFS disk quotas
SYNOPSIS
gfs_quota <list|sync|get|limit|warn|check|init> [OPTION]...
DESCRIPTION
gfs_quota is used to examine and change quota values in a GFS filesystem. This command has a number of different actions.
ACTIONS
list List the contents of the quota file. Only IDs that have a non-zero hard limit, warn limit, or value are printed.
sync Sync any local quota changes to the quota file.
get Get the current data for the ID specified by the -u or -g argument.
limit Set the current hard limit for the ID specified by the -u or -g argument to the value specified by the -l argument on the specified
filesystem. The filesystem won't let the user or group use more than this much space. A value of zero here means that no limit is
enforced.
warn Set the current warn limit for the ID specified by the -u or -g argument to the value specified by the -l argument on the specified
filesystem. The filesystem will start complaining to the user or group when more than this much space is used. A value of zero
here means that the user won't ever be warned.
check Scan a filesystem and make sure that what's out there on the disk matches what's in the quota file. This is only accurate if the
filesystem is idle when this is running. If there is a mismatch, it is printed to stdout. Note: GFS quotas are transactional and a
quota check is not needed every time there is a system crash.
init Scan a filesystem and initialize the quota file with the values obtained from the scan. The filesystem should be idle when this is
run. You should only need to do this if you upgrade a pre-quota GFS filesystem (pre-GFS 5.1).
OPTIONS
-b The units for disk space are filesystem blocks.
-d Don't include the space allocated to GFS' hidden files in what's reported for the root UID and GID values. This is useful if you're
trying to get the numbers reported by gfs_quota to match up with the numbers reported by du.
-f Directory
Specifies which filesystem to perform the action on.
-g GID Specifies the group ID for get, limit, or warn. It can be either the group name from the group file, or the GID number.
-h Print out a help message describing available options, then exit.
-k The units for disk space are kilobytes.
-l Size
Specifies the new value for the limit or warn actions. The value is assumed to be in the units specified by the -m, -k, -s, -b
arguments. The default is megabytes.
-m The units for disk space are megabytes. This is the default.
-n Don't try to resolve UIDs and GIDs into user and group names.
-s The units for disk space are sectors (512-byte blocks).
-u UID Specifies the user ID for get, limit, or warn. It can be either the username from the password file, or the UID number.
-V Print program version information, then exit.
EXAMPLE
To set the hard limit for user "nobody" to 1048576 kilobytes on filesystem /gfs0
gfs_quota limit -l 1048576 -k -u nobody -f /gfs0
gfs_quota(8)