From: Emmanuel Gelati <emi2fast@gmail.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Cc: norbuurgen@gmail.com
Subject: Re: [linux-lvm] what is the IOPS behavior when partitions of single disk(raid5 backend) are used in an LVM?
Date: Thu, 11 Oct 2018 16:31:26 +0200 [thread overview]
Message-ID: <CAE7pJ3DZn9H5BXSuTo=uuFfVZQYxYymvzaAN21hCfhA+=AWO5w@mail.gmail.com> (raw)
In-Reply-To: <20181011142550.GA15437@redhat.com>
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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@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.
>
> _______________________________________________
> 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/
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next prev parent reply other threads:[~2018-10-11 14:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-11 3:08 [linux-lvm] what is the IOPS behavior when partitions of single disk(raid5 backend) are used in an LVM? Sherpa Sherpa
2018-10-11 14:25 ` David Teigland
2018-10-11 14:31 ` Emmanuel Gelati [this message]
2018-10-12 12:02 ` Heinz Mauelshagen
2018-10-12 15:46 ` Sherpa Sherpa
2018-10-15 14:48 ` Heinz Mauelshagen
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