B. Thus the total full space would come to 4.89 TB. But the sum of
full
space of all my LV's is only around 3 TB (based on the output of df)
It's the same thing as making a new partition covering your whole drive,
then wondering why fdisk says you can't make another partition. Just
because you haven't stored files in that partition, it's still takes
up the whole drive.
df shows that your LVs take up 8.6TB: 6TB + 600 GB + 2 TB.
Therefore, you are using 8.6TB of disk space for those LVs.
Some of the space WITHIN each LV might not be used for files,
but it has been dedicated to that LV.
df also shows that the filesystems on the LVs have free space for
more files. So you can put more files on those LVs, which is a
different thing than having space to make more LVs.
I'm not good at explaining things, so sometimes I try explaining three
different ways. I have six cereal boxes, each half empty. I put the
boxes in a bag. The bag is now full. The cereal boxes may not be full,
but they fill up the bag. The cereal boxes are your half empty LVs and
the bag is your drives.
Layers:
hard drive
partition (can be skipped)
physical volume
volume group
logical volume
file system
--
Ray Morris
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On 08/10/2010 09:25:15 PM, Rahul Nabar wrote:
Some of the physical volumes show "Allocatable yes (but
full)" while others don't. How does one relate this to the actual
capacity? THe reason I am confused is that 3 of my PV's show up as
full and each is 1.63 TB. Thus the total full space would come to 4.89
TB. But the sum of full space of all my LV's is only around 3 TB
(based on the output of df)
I've reproduced the outputs of pvdisplay, lvdisplay and df below.
I'm confused! Any pointers?
--
Rahul
[root@eustorage ~]# pvdisplay
--- Physical volume ---
PV Name /dev/sdb
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 428351
Free PE 0
Allocated PE 428351
PV UUID wDdbmP-2n5m-98HD-Ewqk-Q3y0-lnMf-rsaVXt
--- Physical volume ---
PV Name /dev/sdc
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 428351
Free PE 0
Allocated PE 428351
PV UUID 75i75q-2rec-2FMf-eyPa-W0nF-zFHH-PIAvvc
--- Physical volume ---
PV Name /dev/sdd
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 428351
Free PE 0
Allocated PE 428351
PV UUID vo2Jh2-PfFC-eOj4-GYnP-Jx1I-Sisu-2nY4lC
--- Physical volume ---
PV Name /dev/sde
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 428351
Free PE 38140
Allocated PE 390211
PV UUID EK7cvF-IZjf-PJVw-d2RR-lCdt-kOSD-iqFtOf
--- Physical volume ---
PV Name /dev/sdf
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 428351
Free PE 140607
Allocated PE 287744
PV UUID fQXN8S-HhYu-weoq-kbuz-BrxZ-6WQk-6ydBDw
--- Physical volume ---
PV Name /dev/sdg
VG Name euclid_highperf_storage
PV Size 1.63 TB / not usable 4.00 MB
Allocatable yes
PE Size (KByte) 4096
Total PE 428351
Free PE 140607
Allocated PE 287744
PV UUID i7GD1d-rbd2-efKd-uK3u-D3S2-BxJv-UkrNve
[root@eustorage ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 76G 8.6G 64G 12% /
/dev/sda6 19G 365M 17G 3% /var
/dev/sda5 15G 165M 14G 2% /tmp
/dev/sda1 487M 17M 445M 4% /boot
tmpfs 24G 0 24G 0% /dev/shm
/dev/mapper/euclid_highperf_storage-LV_home
6.0T 1.4T 4.4T 24% /home
/dev/mapper/euclid_highperf_storage-LV_export
591G 17G 550G 3% /opt
/dev/mapper/euclid_highperf_storage-LV_polhome
2.0T 1.5T 386G 80% /polhome
[root@eustorage ~]# lvdisplay
--- Logical volume ---
LV Name /dev/euclid_highperf_storage/LV_home
VG Name euclid_highperf_storage
LV UUID gu7yo1-TYYr-ucHG-QSDk-y8HD-ETrs-Z5kCk9
LV Write Access read/write
LV Status available
# open 1
LV Size 6.00 TB
Current LE 1572864
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1536
Block device 253:0
--- Logical volume ---
LV Name /dev/euclid_highperf_storage/LV_export
VG Name euclid_highperf_storage
LV UUID 1lktLy-Hgn3-qS1m-41VJ-5kNY-DMyb-1ri4Th
LV Write Access read/write
LV Status available
# open 1
LV Size 600.00 GB
Current LE 153600
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 1536
Block device 253:1
--- Logical volume ---
LV Name /dev/euclid_highperf_storage/LV_polhome
VG Name euclid_highperf_storage
LV UUID xqpOX5-HFey-H0qi-NgjP-NVS7-FwDb-zbiK8m
LV Write Access read/write
LV Status available
# open 1
LV Size 2.00 TB
Current LE 524288
Segments 4
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
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