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Top Forums UNIX for Dummies Questions & Answers I/O performance in HPUX file systems Post 302351224 by TonyFullerMalv on Monday 7th of September 2009 05:24:10 PM
Old 09-07-2009
Quote:
Originally Posted by Davinzy
HI Tony,
how can I check how many physical volumes are there ?
From what I remember you run:
# df -k .
in the data volume to determine the logical volume (LV) it is stored in.

# lvdisplay -v lvnn
where lvnn is the name and number of the LV your data is stored in to see what volume group your LV is part of.

# vgdisplay vgnn
where vgnn is the name and number of the volume group (VG).

This will tel you how many Physical Volumes (PVs) your VG is spread over, they could be slices of disks some on the same disk just top confuse matters and the VGs could be divided into several LVs but hopefully your system is using whole disks and the VG is dedicated to the LV your data is stored in!

I hope that helps?


Edit:
I should have said that by the sounds of what you say you do need the volume striped over as many disks as possible to get the best bandwidth and access time for your parallel processing on multiple small files.

Last edited by TonyFullerMalv; 09-07-2009 at 07:27 PM..
 

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mountall(1M)															      mountall(1M)

NAME
mountall, umountall - mount and unmount multiple file systems SYNOPSIS
FStype] [file_system_table | FStype] DESCRIPTION
is used to mount file systems according to file_system_table. By default, is the file_system_table. If a dash is specified, reads file_system_table from the standard input; the standard input must be in the same format as the Before each file system is mounted, a check is done using (see fsck(1M)) to ensure that the file system is mountable. If the file system is not mountable, it is repaired by before the mount is attempted. causes all mounted file systems except the non-removable file systems such as to be unmounted. Options and recognize the following options: Specify the file system type (FStype) to be mounted or unmounted. Specify action on local file systems only. Specify action on remote file systems only. Send a signal to processes that have files opened. Attempt to mount all the unmounted file systems. This option will not perform the file system consistency check and repair. Perform the file system consistency check and repair on all unmounted file system. This option will not mount the file systems. DIAGNOSTICS
Error and warning messages may originate from or See fsck(1M), mount(1M), or fuser(1M) to interpret the error and warning messages. EXAMPLES
Mount all unmounted file systems listed in Mount all local file systems listed in Mount all remote file systems listed in Mount all local hfs file systems: Unmount all NFS file systems and kill any processes that have files opened in the file system: WARNINGS
especially with the option, should be used with extreme caution, because it can cause severe damage. The option may not be available in future releases. may not be effective with some cases of LOFS file systems. FILES
Static information about the file systems Mounted file system table SEE ALSO
fsck(1M), mount(1M), fuser(1M), mnttab(4), fstab(4), signal(2) mountall(1M)
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