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Re: [linux-lvm] calculating free capacity from pvdisplay and lvdisplay



2010/8/11 Rahul Nabar <rpnabar gmail com>
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


Hi Rahul,
you really appear to have 6 PV (not three) of 1.63TB each and all that storage space is assigned to the VG euclid_highperf_storage .
The VG has three LV defined from it and indeed has free space; using these LV you  created three filesystems which have free space too, as Ray just explained.

You have not shown the output of a vgs command but if If you issue it you should see something like this:

#vgs
  VG         #PV #LV #SN Attr   VSize VFree
  euclid_highperf_storage  6   3   0 wz--n- 9.8T   1.22T

and so you still have 1.22 TB of free space to use

some math...

Details from pvdisplay:
PE Size (KByte)  4096  = 4MB
VG Name          euclid_highperf_storage
Total PE= 428351*6 = 2570106*4MB = 10280424 MB = 9.8TB
total Free PE: 38140+140607+140607 = 319354*4MB = 1277416M = 1.22 TB
total Allocated PE: 428351*3+390211+287744+287744 = 2250752*4MB = 9003008 MB = 8.58 TB

Details from lvdisplay:
Current LE     1572864+153600+524288 = 2250752
exactly like the Allocated PE in pvdisplay

Best regards,
Giorgio.



[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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