07-30-2013
Disk Space Allocation
Hi,
I have installed RHEL6 on a HP Dl360 with 2 x 300G disk drives.
The logical volume (SMART ARRY) uses RAID 0+1.
All file systems occupy a max of 50G in disk space leaving 250G free disk space. A possible 100G will get used for the application later.
My question is, will creating a large vg of 300G (minus 512M for /boot) have a performance impact or any other disadvantage given that the majority of the vg will be made up of free extents?
R,
D.
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LEARN ABOUT HPUX
prealloc
prealloc(2) System Calls Manual prealloc(2)
NAME
prealloc - preallocate fast disk storage
SYNOPSIS
DESCRIPTION
is used to preallocate space on a disk for faster storage operations.
fildes is a file descriptor obtained from a or system call for an ordinary file of zero length. It must be opened writable, because it
will be written to by size is the size in bytes to be preallocated for the file specified by fildes. At least size bytes will be allo-
cated. Space is allocated in an implementation-dependent fashion for fast sequential reads and writes. The EOF in an extended file is
left at the end of the preallocated area. The current file pointer is left at zero. The file is zero-filled.
Using on a file does not give the file an attribute that is inherited when copying or restoring the file using a program such as or (see
cp(1) and tar(1)). It simply ensures that disk space has been preallocated for size bytes in a manner suited for sequential access. The
file can be extended beyond these limits by operations past the original end of file. However, this space will not necessarily be allo-
cated using any special strategy.
RETURN VALUE
Upon successful completion, returns 0; otherwise, it returns -1 and sets to indicate the error.
ERRORS
fails and no disk space is allocated if any of the following conditions are encountered:
[EBADF] fildes is not a valid open file descriptor opened for writing.
[EDQUOT] User's disk quota block limit has been reached for this file system.
[EFBIG] size exceeds the maximum file size or the process's file size limit. See ulimit(2).
[ENOSPC] Not enough space is left on the device to allocate the requested amount; no space was allocated.
[ENOTEMPTY] fildes not associated with an ordinary file of zero length.
EXAMPLES
Assuming a process has opened a file for writing, the following call to preallocates at least 50000 bytes on disk for the file represented
by file descriptor outfd:
WARNINGS
Allocation of the file space is highly dependent on current disk usage. A successful return does not tell you how fragmented the file
actually might be if the disk is nearing its capacity.
AUTHOR
was developed by HP.
SEE ALSO
prealloc(1), creat(2), dup(2), fcntl(2), open(2), prealloc64(2), read(2), ulimit(2), write(2).
prealloc(2)