[linux-lvm] Maximum # of PEs Per PV
Holger Rauch
Holger.Rauch at heitec.de
Wed Jan 31 17:30:37 UTC 2001
Hi!
A friend of mine installed three 80G disks in order to create a 240G LV
for his file server. The machine had a 2.4.1 kernel and LVM 0.9.1beta3
installed.
In order to create the LV, I first created primary partition of type 8e,
then the PVs using pvcreate:
pvcreate /dev/hd[f-h]1
and then the volume group with vgcreate:
vgcreate mp3 /dev/hd[f-h]1
When I was trying to create a LV of 240G in size, using
lvcreate -n fjdb -L 240G mp3
I got a message telling me that I may only use a certain number of
PEs (more precisely 58623; see below)
Doing a "vgdisplay -v mp3" gave me:
--- Volume group ---
VG Name mp3
VG Access read/write
VG Status available/resizable
VG # 0
MAX LV 256
Cur LV 1
Open LV 1
MAX LV Size 255.99 GB
Max PV 256
Cur PV 3
Act PV 3
VG Size 229 GB
PE Size 4 MB
Total PE 58623
Alloc PE / Size 58623 / 229 GB
Free PE / Size 0 / 0
VG UUID o4Zrsk-bibt-SbCy-d15O-mi5H-vw9r-lppgBA
--- Logical volume ---
LV Name /dev/mp3/fjdb
VG Name mp3
LV Write Access read/write
LV Status available
LV # 1
# open 1
LV Size 229 GB
Current LE 58623
Allocated LE 58623
Allocation next free
Read ahead sectors 120
Block device 58:0
--- Physical volumes ---
PV Name (#) /dev/hdf1 (1)
PV Status available / allocatable
Total PE / Free PE 19541 / 0
PV Name (#) /dev/hdg1 (2)
PV Status available / allocatable
Total PE / Free PE 19541 / 0
PV Name (#) /dev/hdh1 (3)
PV Status available / allocatable
Total PE / Free PE 19541 / 0
"lvdisplay /dev/mp3/fjdb" also told me that the LV is only 229G in size:
--- Logical volume ---
LV Name /dev/mp3/fjdb
VG Name mp3
LV Write Access read/write
LV Status available
LV # 1
# open 1
LV Size 229 GB
Current LE 58623
Allocated LE 58623
Allocation next free
Read ahead sectors 120
Block device 58:0
After creating the file system with "mkreiserfs /dev/mp3/fjdb", the output
of "df -k" was:
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hde1 2071296 99920 1866152 5% /
/dev/hde2 4200856 504176 3696680 12% /home
/dev/hde4 13365668 6056124 7309544 45% /usr
/dev/mp3/fjdb 240112476 32840 240079636 0% /fjdb
Now, I've got a few questions:
1. Why do I only have 229GB available on this volume group instead of
240G?
2. What is the maximum number of PEs per VG? I was looking in the HOWTOs
for LVM limits, but I could not find anything on this issue.
3. Why does "df -k" tell me that I nevertheless have 240G available?
Thanks in advance! Any help is greatly appreciated!
Greetings,
Holger
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