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Re: [linux-lvm] How do I find out if my logic volume is striped or not?



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 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 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 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 Sistina com                           +49 2626 141200
> > >                                                        FAX 924446
> > > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> > > _______________________________________________
> > > linux-lvm mailing list
> > > linux-lvm 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 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 Sistina com                           +49 2626 141200
>                                                        FAX 924446
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> _______________________________________________
> linux-lvm mailing list
> linux-lvm 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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