On 10/11/18 4:31 PM, Emmanuel Gelati wrote:
If you use sdb only for data, you don't have need to use partition on the disk.

Though that's true, keeping 1 partition per disk for each LVM PV adds additional 'visibility' by tools like fdisk/[cs]fdisk, parted etc. showing the partition type to be 'Liinux LVM'.

Using the whole disk, blkid or lsblk will provide that information still,
e.g. 'blkid --match-token TYPE=LVM2_member'.

Heinz


Il giorno gio 11 ott 2018 alle ore 16:26 David Teigland <[email protected] <mailto:[email protected]>> 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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