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On 10/12/18 5:46 PM, Sherpa Sherpa
wrote:
Thank you for reply i dont mind if fstab sees
partitions. I
read this "To avoid striping performance
problems LVM can't tell that two PVs are on the same physical
disk, so if
you create a striped LV then the stripes could be on different
partitions on the same disk resulting in a *decrease*
in performance rather than an increase." in the tldp.org
but does this apply to disks made from RAID backend ?
If you use partitioning, only create one partition per backing
device and use it as a PV.
This avoids striping across multiple PVs on the same backing
device.
The same config flaw (i.e. use multiple partitions on the same
backing device as PVs thus potentially
stripe across them) may apply to any backing store allowing for
partitioning. So don't do it on SW/HW RAID either.
Heinz
Warm Regards
Urgen Sherpa
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
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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