RE: [linux-lvm] half my space lost

RE: [linux-lvm] half my space lost

[Koch, Steffen]

Hello again,

> Thank you for this explanation which sounds very clear.
> 
> One more question please. I do not understand why I can not 
> extend my VG with the second RAID partition: [root@fw root]# 
> pvdisplay /dev/md/8 pvdisplay -- "/dev/md/8" is a new 
> physical volume of 125.38 MB
> 
> [root@fw root]# vgextend secured /dev/md/8
> vgextend -- INFO: maximum logical volume size is 2 Terabyte 
> vgextend -- ERROR: physical volume "/dev/md/8" too small for 
> physical extent siz e of volume group "secured"
Seems that the extent size of your other vg is larger than the available
size of your new md8.

A question I have: Why do you want to extend your 17 GB VG with 2*128 MB??
Doesn't make much sense to me...

Re: [linux-lvm] half my space lost

[Ronan-Yann Lorin]

I tried to extend my 96Mb VG "secured" with (default) extend size of 32M
with 1*128Mb /dev/md/8.

I recreated it with an extend size of 1Mb and with /dev/md/7 + /dev/md/8 PV.
It worked. Since then I added some more PV to it without problem. I now
trying to move my root partition on it.

----- Original Message -----
From: Koch, Steffen <steffen.koch@sphinx-electronics.de>
To: <linux-lvm@sistina.com>
Sent: Friday, December 05, 2003 4:11 PM
Subject: RE: [linux-lvm] half my space lost


> Hello again,
>
> > Thank you for this explanation which sounds very clear.
> >
> > One more question please. I do not understand why I can not
> > extend my VG with the second RAID partition: [root@fw root]#
> > pvdisplay /dev/md/8 pvdisplay -- "/dev/md/8" is a new
> > physical volume of 125.38 MB
> >
> > [root@fw root]# vgextend secured /dev/md/8
> > vgextend -- INFO: maximum logical volume size is 2 Terabyte
> > vgextend -- ERROR: physical volume "/dev/md/8" too small for
> > physical extent siz e of volume group "secured"
> Seems that the extent size of your other vg is larger than the available
> size of your new md8.
>
> A question I have: Why do you want to extend your 17 GB VG with 2*128 MB??
> Doesn't make much sense to me...
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>

RE: [linux-lvm] half my space lost

[Ronan-Yann Lorin]

Thank you for this explanation which sounds very clear.

One more question please. I do not understand why I can not extend my VG with the
second RAID partition:
[root@fw root]# pvdisplay /dev/md/8
pvdisplay -- "/dev/md/8" is a new physical volume of 125.38 MB

[root@fw root]# vgextend secured /dev/md/8
vgextend -- INFO: maximum logical volume size is 2 Terabyte
vgextend -- ERROR: physical volume "/dev/md/8" too small for physical extent siz
e of volume group "secured"

Thanks in advance.

Koch, Steffen (steffen.koch@sphinx-electronics.de) wrote*:
>
>Hello,
>
>> [root@fw root]# vgcreate secured /dev/md/7
>> vgcreate -- INFO: using default physical extent size 32 MB
>> vgcreate -- INFO: maximum logical volume size is 2 Terabyte
>> vgcreate -- doing automatic backup of volume group "secured"
>> vgcreate -- volume group "secured" successfully created and activated
>As it is stated here an extent is 32 MB, and one extent is always lost at
>the beginning of the md (partition, disk, etc.) for metadata information.
>This should leave you with 125 MB - 32 MB = 93 MB.
>LVM volumes have to be a multiple of the extent size. So 32MB, 64 MB, 96 MB.
>As you can see your remaining space is 3 MB too little for a 3 extent
>volume, leaving you with a 2 extent volume with 2 * 32 MB = 64 MB
>
>> The size of the partition get shrink by half:
>>
>> [root@fw root]# pvscan
>> pvscan -- reading all physical volumes (this may take a while...)
>> pvscan -- ACTIVE   PV "/dev/md/7"
>>   of VG "secured"
>> [64 MB / 64 MB free]
>> pvscan -- inactive PV "/dev/md/8"
>>   is in no VG
>> [125.38 MB]
>> pvscan -- ACTIVE   PV
>> "/dev/ide/host0/bus1/target0/lun0/part13" of VG "lvm1"
>> [17 GB / 16.97 GB fr
>> pvscan -- total: 3 [17.28 GB] / in use: 2 [17.16 GB] / in no
>> VG: 1 [125.38 MB]
>>
>> Is this a known/solved problem?
>> Did I made a mistake?
>>
>> Thanks in advance for your help.
>> Regards.
>
>Hope the explanation helped.
>
>_______________________________________________
>linux-lvm mailing list
>linux-lvm@sistina.com
>http://lists.sistina.com/mailman/listinfo/linux-lvm
>read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
>

--
R.Y. Lorin
mailto:ryl@free.fr
http://les-lorin.webhop.net/

RE: [linux-lvm] half my space lost

[Koch, Steffen]

Hello,

> [root@fw root]# vgcreate secured /dev/md/7
> vgcreate -- INFO: using default physical extent size 32 MB 
> vgcreate -- INFO: maximum logical volume size is 2 Terabyte 
> vgcreate -- doing automatic backup of volume group "secured" 
> vgcreate -- volume group "secured" successfully created and activated
As it is stated here an extent is 32 MB, and one extent is always lost at
the beginning of the md (partition, disk, etc.) for metadata information.
This should leave you with 125 MB - 32 MB = 93 MB.
LVM volumes have to be a multiple of the extent size. So 32MB, 64 MB, 96 MB.
As you can see your remaining space is 3 MB too little for a 3 extent
volume, leaving you with a 2 extent volume with 2 * 32 MB = 64 MB

> The size of the partition get shrink by half:
> 
> [root@fw root]# pvscan
> pvscan -- reading all physical volumes (this may take a while...)
> pvscan -- ACTIVE   PV "/dev/md/7"                             
>   of VG "secured"
> [64 MB / 64 MB free]
> pvscan -- inactive PV "/dev/md/8"                             
>   is in no VG
> [125.38 MB]
> pvscan -- ACTIVE   PV 
> "/dev/ide/host0/bus1/target0/lun0/part13" of VG "lvm1"
> [17 GB / 16.97 GB fr
> pvscan -- total: 3 [17.28 GB] / in use: 2 [17.16 GB] / in no 
> VG: 1 [125.38 MB]
> 
> Is this a known/solved problem?
> Did I made a mistake?
> 
> Thanks in advance for your help.
> Regards.

Hope the explanation helped.

[linux-lvm] half my space lost

[Ronan-Yann Lorin]

Hi,

I'm using LVM 1.0.7 on Linux 2.4.22 (Mandrake 9.2).
I'm triyng to setup a VG build on RAID 1 partitions.
When the parition is added to the VG, half of it space mysteriously disapear.

for example:

my RAID 1 partitions are /dev/md/7 and /dev/md/8 and are about 128Mb size.

[root@fw root]# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- inactive PV "/dev/md/7"                               is in no VG
[125.38 MB]
pvscan -- inactive PV "/dev/md/8"                               is in no VG
[125.38 MB]
pvscan -- ACTIVE   PV "/dev/ide/host0/bus1/target0/lun0/part13" of VG "lvm1" [17
GB / 16.97 GB free]
pvscan -- total: 3 [17.28 GB] / in use: 1 [17.04 GB] / in no VG: 2 [250.75 MB]

I create one VG using one of the RAID 1 partitions:

[root@fw root]# vgcreate secured /dev/md/7
vgcreate -- INFO: using default physical extent size 32 MB
vgcreate -- INFO: maximum logical volume size is 2 Terabyte
vgcreate -- doing automatic backup of volume group "secured"
vgcreate -- volume group "secured" successfully created and activated

The size of the partition get shrink by half:

[root@fw root]# pvscan
pvscan -- reading all physical volumes (this may take a while...)
pvscan -- ACTIVE   PV "/dev/md/7"                               of VG "secured"
[64 MB / 64 MB free]
pvscan -- inactive PV "/dev/md/8"                               is in no VG
[125.38 MB]
pvscan -- ACTIVE   PV "/dev/ide/host0/bus1/target0/lun0/part13" of VG "lvm1"
[17 GB / 16.97 GB fr
pvscan -- total: 3 [17.28 GB] / in use: 2 [17.16 GB] / in no VG: 1 [125.38 MB]

Is this a known/solved problem?
Did I made a mistake?

Thanks in advance for your help.
Regards.

--
R.Y. Lorin
mailto:ryl@free.fr
http://les-lorin.webhop.net/