[linux-lvm] How do I find out if my logic volume is striped or not?
Eric Wang
mrlist at ActiveState.com
Fri Jun 1 17:58:02 UTC 2001
Thanks Heinz!
Let me make straight, you mean if I created a stripped lv, and then I
will not be able to extent the lv to a other pv?
then if I have 3 pv in different size, then
lvcreate -i 3 -I 4 -L all_disk_sparce -n name vgname
will never work? or maybe untill version 1.0 it will work?
And I still have a question, if I have both SCSI and IDE disks in one
machine , if I can created a big lv with pv come from both SCSI and IDE
disks?
On Fri, 1 Jun 2001 14:08:05 +0200
"Heinz J. Mauelshagen" <Mauelshagen at sistina.com> wrote:
> On Thu, May 31, 2001 at 10:08:06AM -0700, Eric Wang wrote:
> > I am trying to achive the best performance
> > here is my situation
>
> Eric,
> in your IDE case you could gain performance setting up a striped LV
> on hda *or* hdb and hdc.
> IDE devices sitting on the same adaptor suffer from io constraints
> and therefore don't give you parallel thrughput.
>
> >
> > #vgdisplay -v
> > --- Volume group ---
> > VG Name TITAN
> > VG Access read/write
> > VG Status available/resizable
> > VG # 0
> > MAX LV 256
> > Cur LV 1
> > Open LV 0
> > MAX LV Size 255.99 GB
> > Max PV 256
> > Cur PV 3
> > Act PV 3
> > VG Size 98.65 GB
> > PE Size 4 MB
> > Total PE 25255
> > Alloc PE / Size 19482 / 76.1 GB
> > Free PE / Size 5773 / 22.55 GB
> > VG UUID c2I7Km-QuZy-O3GK-nUXL-WtAC-VHRO-r75ivY
> >
> > --- Logical volume ---
> > LV Name /dev/TITAN/home
> > VG Name TITAN
> > LV Write Access read/write
> > LV Status available
> > LV # 1
> > # open 0
> > LV Size 76.1 GB
> > Current LE 19482
> > Allocated LE 19482
> > Stripes 2
> > Stripe size (KByte) 4
> > Allocation next free
> > Read ahead sectors 120
> > Block device 58:0
> >
> >
> > --- Physical volumes ---
> > PV Name (#) /dev/hda9 (3)
> > PV Status available / allocatable
> > Total PE / Free PE 5649 / 5649
> >
> > PV Name (#) /dev/hdb1 (1)
> > PV Status available / allocatable
> > Total PE / Free PE 9803 / 63
> >
> > PV Name (#) /dev/hdc1 (2)
> > PV Status available / allocatable
> > Total PE / Free PE 9803 / 63
> >
> > I am trying to create stripped lv here, how I am going to do that?
>
> You already created one; see the lines above saying "Stripes 2" and
> "Stripe size (KByte) 4".
>
> >
> > anyway an odd problem is after create a stripped lv then vgextent the vg
> > with /dev/hda9, but I can't lvextent the lv
> > # lvextend -L+20G /dev/TITAN/home
> > lvextend -- extending logical volume "/dev/TITAN/home" to 96.1 GB
> > lvextend -- not enough free/allocatable physical extents to extend logical volume "/dev/TITAN/home"
> >
> > what was the problem?
>
> That's a constraint of the LVM which will disapear in a post 1.0 release.
> If you want to extend on multiple PVs you need to go with a linear LV.
>
> Regards,
> Heinz -- The LVM Guy --
>
> >
> >
> > On Thu, 31 May 2001 14:34:57 +0200
> > "Heinz J. Mauelshagen" <Mauelshagen at sistina.com> wrote:
> >
> > >
> > > Eric,
> > >
> > > lvdisplay shows lines beginning with "Stripes" and "Stripe size (KByte)"
> > > in case you use it on a striped LV and /proc/lvm/global displays
> > > information as well.
> > >
> > > On Wed, May 30, 2001 at 07:11:36PM -0700, Eric Wang wrote:
> > > > Hi all,
> > > >
> > > > How do I find out if my logic volume is striped or not?
> > > > lvdisplay seems not produce this information.
> > > >
> > > > Thanks
> > > > _______________________________________________
> > > > linux-lvm mailing list
> > > > linux-lvm at sistina.com
> > > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> > >
> > > --
> > >
> > > Regards,
> > > Heinz -- The LVM Guy --
> > >
> > > *** Software bugs are stupid.
> > > Nevertheless it needs not so stupid people to solve them ***
> > >
> > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> > >
> > > Heinz Mauelshagen Sistina Software Inc.
> > > Senior Consultant/Developer Am Sonnenhang 11
> > > 56242 Marienrachdorf
> > > Germany
> > > Mauelshagen at Sistina.com +49 2626 141200
> > > FAX 924446
> > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> > > _______________________________________________
> > > linux-lvm mailing list
> > > linux-lvm at sistina.com
> > > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
> >
> >
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm at sistina.com
> > http://lists.sistina.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
>
> *** Software bugs are stupid.
> Nevertheless it needs not so stupid people to solve them ***
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> Heinz Mauelshagen Sistina Software Inc.
> Senior Consultant/Developer Am Sonnenhang 11
> 56242 Marienrachdorf
> Germany
> Mauelshagen at Sistina.com +49 2626 141200
> FAX 924446
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at sistina.com
> http://lists.sistina.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://www.sistina.com/lvm/Pages/howto.html
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