[linux-lvm] Meaning of strict allocation

[linux-lvm] Meaning of strict allocation

[sachin]

Hi

when I  executed the lvdisplay command  i get the following output

--- Logical volume ---
LV Name                /dev/vg/lv1
VG Name                vg
LV Write Access        read/write
LV Status              available
LV #                   1
# open                 0
LV Size                4 GB
Current LE             1024
Allocated LE           1024
Stripes                4
Stripe size (KByte)    16
Allocation             next free
Read ahead sectors     1024
Block device           58:0

Can any one tell  me what that ALLOCATION next free means
and also what strict allocation means.

I also tried lvdisplay  with -v option

it gives me read and writes
What that exactly means 
      1. No of read and write operation
      2  No of blocks transferd 
      3. No of sectors read or written 

One more thing  this io statics is from which time 
     1. bootup time
     2. lv creation time

Thanks
Sachin. 

Re: [linux-lvm] Meaning of strict allocation

[Heinz Mauelshagen]

On Thu, Apr 08, 2004 at 07:57:07PM -0700, sachin wrote:
> Hi
> 
> when I  executed the lvdisplay command  i get the following output
> 
> --- Logical volume ---
> LV Name                /dev/vg/lv1
> VG Name                vg
> LV Write Access        read/write
> LV Status              available
> LV #                   1
> # open                 0
> LV Size                4 GB
> Current LE             1024
> Allocated LE           1024
> Stripes                4
> Stripe size (KByte)    16
> Allocation             next free
> Read ahead sectors     1024
> Block device           58:0
> 
> Can any one tell  me what that ALLOCATION next free means
> and also what strict allocation means.

'Next free' allocates the next free physical extents it finds in
the VG while extending any logical volume.

There's no 'strict' allocation in LVM.
Your other option is 'contiguous' which means allocation of subsequent areas
of PEs.

> 
> I also tried lvdisplay  with -v option
> 
> it gives me read and writes
> What that exactly means 
>       1. No of read and write operation
>       2  No of blocks transferd 
>       3. No of sectors read or written 

1

> 
> One more thing  this io statics is from which time 
>      1. bootup time
>      2. lv creation time

3. VG activation time (vgchange -ay)

> 
> Thanks
> Sachin. 
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

-- 

Regards,
Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***

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Heinz Mauelshagen                                 Red Hat GmbH
Consulting Development Engineer                   Am Sonnenhang 11
                                                  56242 Marienrachdorf
                                                  Germany
Mauelshagen@RedHat.com                            +49 2626 141200
                                                       FAX 924446
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