[linux-lvm] Meaning of strict allocation
Heinz Mauelshagen
mauelshagen at redhat.com
Wed Apr 14 08:44:04 UTC 2004
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.
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> 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 at RedHat.com +49 2626 141200
FAX 924446
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