Category Archives: Troubleshooting

HowTo Mount 8TB USB in CentoS 7 Server.

This howto is about “How To mount 8TB External USB” in CentOs 7 server.

# yum – y install epel-release

# yum -y install ntfs-3g

# lsblk

sdc 8:32 0 7.3T 0 disk
└─sdc1 8:33 0 7.3T

# mount -t ntfs /dev/sdc1 /mnt/

# ls -ltr /mnt

You will see it’s mounted.

Thanks,

Salman A. Francis

YouTube: LinuxKing

Facebook: Linuxking77 – LZHProject

How to Add Physical Disk to Increase Size of /dev/mapper/centos-root

Dear Friends,

I ran into a problem where my openstack machine ran out of space. My Logical FS /dev/mapper/centos-root was only 50GB and most of the space was lost.

Solution:
LVM

I Added a new 500GB HDD (sdb), created partition with parted (sdb1) and gave the below commands:

[root@stack opt]# pvcreate /dev/sdb1
Physical volume "/dev/sdb1" successfully created

Next Check your Volumes with “vgdisplay” command

[root@stack opt]# vgdisplay 
 --- Volume group ---
 VG Name centos
 System ID 
 Format lvm2
 Metadata Areas 1
 Metadata Sequence No 4
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 3
 Open LV 3
 Max PV 0
 Cur PV 1
 Act PV 1
 VG Size 465.27 GiB
 PE Size 4.00 MiB
 Total PE 119109
 Alloc PE / Size 119109 / 465.27 GiB
 Free PE / Size 0 / 0 
 VG UUID TrvUI3-Xt7U-6vzF-5RtW-OfK0-OCOy-Tejrb6
 
 --- Volume group ---
 VG Name cinder-volumes
 System ID 
 Format lvm2
 Metadata Areas 1
 Metadata Sequence No 5
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 0
 Open LV 0
 Max PV 0
 Cur PV 1
 Act PV 1
 VG Size 20.60 GiB
 PE Size 4.00 MiB
 Total PE 5273
 Alloc PE / Size 0 / 0 
 Free PE / Size 5273 / 20.60 GiB
 VG UUID 9LDtLm-52Un-1QJA-yc3q-13vE-LqEc-hX0kiU

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