[linux-lvm] what is the IOPS behavior when partitions of single disk(raid5 backend) are used in an LVM?

[Emmanuel Gelati]

If you use sdb only for data, you don't have need to use partition on the
disk.

Il giorno gio 11 ott 2018 alle ore 16:26 David Teigland <teigland at redhat.com>
ha scritto:

> On Thu, Oct 11, 2018 at 08:53:07AM +0545, Sherpa Sherpa wrote:
> > I have LVM(backed by hardware RAID5) with logical volume and a volume
> group
> > named "dbstore-lv" and "dbstore-vg" which have sdb1 sdb2 sdb3 created
> from
> > same sdb disk.
>
> > sdb                                8:16   0  19.7T  0 disk
> > ├─sdb1                             8:17   0   7.7T  0 part
> > │ └─dbstore-lv (dm-1)              252:1    0   9.4T  0 lvm  /var/db/st01
> > ├─sdb2                             8:18   0   1.7T  0 part
> > │ └─dbstore-lv (dm-1)              252:1    0   9.4T  0 lvm  /var/db/st01
> > └─sdb3                             8:19   0  10.3T  0 part
> >   └─archive--archivedbstore--lv (dm-0)     252:0    0  10.3T  0 lvm
>
> > I am assuming this is due to disk seek problem as the same disk
> partitions
> > are used for same LVM or may be its due to saturation of the disks
>
> You shouldn't add different partitions as different PVs.  If it's too late
> to fix, it might help to create new LV that uses only one of the
> partitions, e.g. lvcreate -n lv -L size vg /dev/sdb2, and then copy your
> current LV to the new one.
>
> _______________________________________________
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/



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