mirror lvm

Check this link about lvm mirroring
http://www.tcpdump.com/kb/os/linux/lvm-mirroring/creating-mirror.html

If it were hardware RAID1, then you need to see in BIOS or hardware RAID controller utility.
If it were software RAID1, then please post the output of the following commands (as root)
pvscan
vgscan
lvscan

[root@server ~]# pvscan
  PV /dev/sda5   VG vglocal   lvm2 [37.78 GB / 160.00 MB free]
  PV /dev/sda3   VG vgroot    lvm2 [14.00 GB / 832.00 MB free]
  Total: 2 [51.78 GB] / in use: 2 [51.78 GB] / in no VG: 0 [0   ]
[root@server ~]# lvscan
  ACTIVE            '/dev/vglocal/opt_CA' [320.00 MB] inherit
  ACTIVE            '/dev/vglocal/opt_ihs61' [2.47 GB] inherit
  ACTIVE            '/dev/vglocal/opt_mqm' [640.00 MB] inherit
  ACTIVE            '/dev/vglocal/var_mqm' [160.00 MB] inherit
  ACTIVE            '/dev/vglocal/ora_product' [4.91 GB] inherit
  ACTIVE            '/dev/vglocal/ora_admin' [1.00 GB] inherit
  ACTIVE            '/dev/vglocal/opt_od602' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/opt_WebSphere61x64' [7.84 GB] inherit
  ACTIVE            '/dev/vglocal/app_mpr' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_mpr' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_tfe' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_tfe' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_flf' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_cob' [1.00 GB] inherit
  ACTIVE            '/dev/vglocal/app_hci' [1.00 GB] inherit
  ACTIVE            '/dev/vglocal/app_commonapi' [1.00 GB] inherit
  ACTIVE            '/dev/vglocal/app_moc' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_tbc' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_csc' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_fmc' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_cfc' [512.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_moc' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_tbc' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_csc' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_sls' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_fmc' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/app_ihs_cfc' [256.00 MB] inherit
  ACTIVE            '/dev/vglocal/opt_WebSphere61' [7.84 GB] inherit
  ACTIVE            '/dev/vglocal/opt_ihs61-services' [2.47 GB] inherit
  ACTIVE            '/dev/vglocal/app_sls' [512.00 MB] inherit
  ACTIVE            '/dev/vgroot/lvroot' [4.00 GB] inherit
  ACTIVE            '/dev/vgroot/lvhome' [1.50 GB] inherit
  ACTIVE            '/dev/vgroot/lvtmp' [2.00 GB] inherit
  ACTIVE            '/dev/vgroot/lvvar' [4.00 GB] inherit
  ACTIVE            '/dev/vgroot/tivoli' [512.00 MB] inherit
  ACTIVE            '/dev/vgroot/itm' [1.00 GB] inherit
  ACTIVE            '/dev/vgroot/opsware' [64.00 MB] inherit
  ACTIVE            '/dev/vgroot/vopsware' [128.00 MB] inherit
[root@server ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vglocal" using metadata type lvm2
  Found volume group "vgroot" using metadata type lvm2

from pvscan output, you don't seems have lvm mirror or lvm on software RAID1.
Please also post the following command output for  double check
(as root)
fdisk -l
dmesg |grep sd

Sorry, please also run
lvs

sorry cant paste that just now but could you tell me what i have to look out for to see if it's mirroring or not

i can tell you from fdisk -l you only see /dev/sda and not /dev/sdb - so most likely hardware raid. however , i would like to know what to check for to see if its mirrored with sware raid