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Re: [linux-lvm] Understanding if a disk is partioned with LVM or not



On Thu, Sep 10, 2009 at 09:19:29AM +0300, pent 5971 wrote:
Hi,
Im new to this LVM stuff and still couldnt read and understand enough.
But i have a RHEL 5x box (which i didnt installed) and we have

rhel uses lvm by default
phsically added a new disk which i have to create a file system to be
able to use it.  df -h command gives normal /var /data / partions, but
first column of df output is the device, if it looks like /dev/sd?? or
/dev/hd?? it is a normal partition
if it looks like /dev/mapper/xxxxx-yyyy or /dev/xxxxx/yyyy it is
probably an lvm
also the commands vgs, lvs, and pvs help, i.e.
root Moskowskaya # vgs
  VG   #PV #LV #SN Attr  VSize   VFree
  vg00   1   7   0 wz--n 232.81G 10.81G
root Moskowskaya # pvs
  PV         VG   Fmt  Attr PSize   PFree
  /dev/sda   vg00 lvm2 a-   232.81G 10.81G


id like ask how can i understand if the first disk/sytem is created
with LVM , and if so (any other box can be so in the future) what is
best way to add the disk and crete the file system?
woah, well, the simple answer is: there is no best way, you have to
evaluate the pros and cons yourself.

you could add the new disk to the existing volume group, which would
give you the advantage of using avaliable space as a single pool and
being able to create/extend existing logical volumes/filesystems using
both disks. with the disadvantage of being more painful to recover in
case one of the disks fails.
you could create a new volume group using the new disk, or create a
partition if you are more confortable, or even use the whole device for
the new filesystem.

L.

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