LUN Presentation Post: 302633673

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Operating Systems Linux Red Hat LUN Presentation Post 302633673 by mark54g on Wednesday 2nd of May 2012 10:14:45 AM

05-02-2012

Registered User

Quote:

Originally Posted by Duffs22

Thanks Mark54g,

Now once I have scanned in the new LUN on the OS how do I create a new FS from this space?

Can I use "fdisk" against the dm-<no> to present all paths to the OS?

.....or can I just pvcreate the /dev/dm-<no> and take it from there?

R,
D.

You would work against the dm device like you would /dev/sdb, et al.

You can fdisk it (unless it is too large, then you may need to use parted)

Then you can use mkfs on it to create a file system, unless you use volume groups first, at which point you can do that with pvcreate.

Here's a trick, though. If you are going to add many volumes of the same size (careful on an EVA, they have lower limits on the number of presented LUNs), you can use:

Code:

sfdisk -d <a device with the layout you like>| sfdisk <device you want to copy the layout to>

Last edited by mark54g; 05-02-2012 at 11:45 PM..

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LEARN ABOUT SUSE

vgextend

VGEXTEND(8)						      System Manager's Manual						       VGEXTEND(8)

NAME

       vgextend - add physical volumes to a volume group

SYNOPSIS

       vgextend  [-A|--autobackup  y|n]  [-d|--debug] [-h|-?|--help] [-t|--test] [-v|--verbose] [ PHYSICAL DEVICE OPTIONS ] VolumeGroupName Physi-
       calDevicePath [PhysicalDevicePath...]

DESCRIPTION

       vgextend allows you to add one or more initialized physical volumes ( see pvcreate(8) ) to an existing volume group to extend it in size.

       If PhysicalDevicePath was not previously configured for LVM with pvcreate (8), the device will be initialized with the same default  values
       used  with  pvcreate.  If non-default pvcreate values are are desired, they may be given on the commandline with the same options as pvcre-
       ate.  See PHYSICAL DEVICE OPTIONS for available options.  Note that the restore-related options such as --restorefile, --uuid, and --physi-
       calvolumesize are not available.  If a restore operation is needed, use pvcreate (8) and vgcfgrestore (8).

OPTIONS

       See lvm for common options.

PHYSICAL DEVICE OPTIONS

       The  following  options	are  available	for initializing physical devices in the volume group.	These options are further described in the
       pvcreate man page.

       -f, --force

       -y, --yes

       -Z, --zero y|n

       --labelsector sector

       --metadatasize size

       --pvmetadatacopies copies

       --dataalignment alignment

       --dataalignmentoffset alignment_offset

Examples
       "vgextend vg00 /dev/sda4 /dev/sdn1" tries to extend the existing volume group "vg00"  by  the  new  physical  volumes  (see  pvcreate(8)  )
       "/dev/sdn1" and /dev/sda4".

SEE ALSO

       lvm(8), vgcreate(8), vgreduce(8), pvcreate(8)

Sistina Software UK					 LVM TOOLS 2.02.67(2) (2010-06-04)					       VGEXTEND(8)