Trace: • screen • fclun

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Table of Contents

use lun storage

multipathd

  1. first install multipathd 
    yum install device-mapper-multipath
  2. copy multipath.conf in /etc
  3. restart multipathd 
    service multipathd restart
  4. alias in multipath.conf 
    multipaths {
    multipath {
        wwid 360000970000296800677533030303638
        alias fsilun
    }
}
  5. reload multipathd 
    service multipathd reload
  6. multipathd on startup 
    chkconfig multipathd on

scan luns

  1. look for fc hosts
    ls /sys/class/fc_host

    e.g. you get two: host0 host1

  2. install rescan script 
    yum install sg3_utils
  3. to rescan luns 
    rescan-scsi-bus.sh

    or 

    echo "1" > /sys/class/fc_host/host0/issue_lip
echo "- - -" > /sys/class/scsi_host/host0/scan

    for all hosts

multipath

  1. show 
    multipath -ll

    e.g. you get following output 

    fsilun (360000970000296800677533030303638) dm-1 EMC,SYMMETRIX
size=1000G features='1 queue_if_no_path' hwhandler='0' wp=rw
`-+- policy='round-robin 0' prio=1 status=active
  |- 1:0:1:1 sdd 8:48 active ready running
  |- 2:0:1:1 sdf 8:80 active ready running
  |- 1:0:0:1 sdc 8:32 active ready running
  `- 2:0:0:1 sde 8:64 active ready running

device mapper

  1. create block device in /dev/mapper with fsilun as name
  2. wipe to create new fresh physical volume 
    d if=/dev/zero of=dev/mapper/fsilun bs=512 count=1

lvm

  1. create physical volume 
    pvcreate /dev/mapper/fsilun
    • show pyhsical volume 
      pvdisplay
  2. create volume group 
    gcreate fsilun /dev/mapper/fsilun
    • show volume group 
      vgdisplay
  3. create logical volume (-L <size in PE see above) 
    lvcreate -L 256000 -n lvfsilun fsilun
    • show logical volume 
      lvdisplay

format filesystem

  1. create ext4 filesystem 
    mkfs.ext4 /dev/fsilun/lvfsilun

mount

  1. create mount dir 
    mkdir /mnt/fsilun
  2. mount 
    mount -t ext4 /dev/fsilun/lvfsilun /mnt/fsilun/

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