From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx06.extmail.prod.ext.phx2.redhat.com [10.5.110.30]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u3RCX7OT022443 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO) for ; Wed, 27 Apr 2016 08:33:07 -0400 Received: from mail-ob0-f174.google.com (mail-ob0-f174.google.com [209.85.214.174]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0D3E947046 for ; Wed, 27 Apr 2016 12:33:06 +0000 (UTC) Received: by mail-ob0-f174.google.com with SMTP id j9so21680649obd.3 for ; Wed, 27 Apr 2016 05:33:05 -0700 (PDT) MIME-Version: 1.0 Date: Wed, 27 Apr 2016 14:33:05 +0200 Message-ID: From: Bhasker C V Content-Type: multipart/alternative; boundary=f46d044795f783ddf20531769c6c Subject: [linux-lvm] Lvm think provisioning query Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: linux-lvm@redhat.com --f46d044795f783ddf20531769c6c Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi, I am starting with investigating about the lvm thin provisioning (repeat post from https://lists.debian.org/debian-user/2016/04/msg00852.html ) (apologies for html mail) I have done the following 1.Create a PV vdb 252:16 0 10G 0 disk =E2=94=9C=E2=94=80vdb1 252:17 0 100M 0 part =E2=94=94=E2=94=80vdb2 252:18 0 9.9G 0 part root@vmm-deb:~# pvcreate /dev/vdb1 Physical volume "/dev/vdb1" successfully created. root@vmm-deb:~# pvs PV VG Fmt Attr PSize PFree /dev/vdb1 lvm2 --- 100.00m 100.00m 2. create a VG root@vmm-deb:~# vgcreate virtp /dev/vdb1 Volume group "virtp" successfully created root@vmm-deb:~# vgs VG #PV #LV #SN Attr VSize VFree virtp 1 0 0 wz--n- 96.00m 96.00m 3. create a lv pool and a over-provisioned volume inside it root@vmm-deb:~# lvcreate -n virtpool -T virtp/virtpool -L40M Logical volume "virtpool" created. root@vmm-deb:~# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert virtpool virtp twi-a-tz-- 40.00m 0.00 0.88 root@vmm-deb:~# lvcreate -V1G -T virtp/virtpool -n vol01 WARNING: Sum of all thin volume sizes (1.00 GiB) exceeds the size of thin pool virtp/virtpool and the size of whole volume group (96.00 MiB)! For thin pool auto extension activation/thin_pool_autoextend_threshold should be below 100. Logical volume "vol01" created. root@vmm-deb:~# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert virtpool virtp twi-aotz-- 40.00m 0.00 0.98 vol01 virtp Vwi-a-tz-- 1.00g virtpool 0.00 ---------- Now the operations # dd if=3D/dev/urandom of=3D./fil status=3Dprogress 90532864 bytes (91 MB, 86 MiB) copied, 6.00005 s, 15.1 MB/s^C 188706+0 records in 188705+0 records out 96616960 bytes (97 MB, 92 MiB) copied, 6.42704 s, 15.0 MB/s # df -h . Filesystem Size Used Avail Use% Mounted on /dev/mapper/virtp-vol01 976M 95M 815M 11% /tmp/x # sync # cd .. root@vmm-deb:/tmp# umount x root@vmm-deb:/tmp# fsck.ext4 -f -C0 /dev/virtp/vol01 e2fsck 1.43-WIP (15-Mar-2016) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/virtp/vol01: 12/65536 files (8.3% non-contiguous), 36544/262144 blocks # du -hs fil 93M fil # dd if=3D./fil of=3D/dev/null status=3Dprogress 188705+0 records in 188705+0 records out 96616960 bytes (97 MB, 92 MiB) copied, 0.149194 s, 648 MB/s # vgs VG #PV #LV #SN Attr VSize VFree virtp 1 2 0 wz--n- 96.00m 48.00m Definetly the file is occupying 90+MB. What i expect is that the pool is 40M and the file must NOT exceed 40M. Where does the file get 93M space ? I know the VG is 96M but the pool created was max 40M (also VG still says 48M free). Is the file exceeding the boundaries ? or am I doing anything wrong ? --f46d044795f783ddf20531769c6c Content-Type: text/html; charset=UTF-8 Content-Transfer-Encoding: quoted-printable
Hi,

=C2=A0I am starting with investigating abo= ut the lvm thin provisioning
=C2=A0(repeat post from https://lists.deb= ian.org/debian-user/2016/04/msg00852.html )
=C2=A0(apologies f= or html mail)

=C2=A0I have done the following

1.Create a PVvdb =C2=A0 =C2=A0252:16 =C2=A0 0 =C2=A0 10G =C2=A00 disk
=E2=94=9C=E2= =94=80vdb1 252:17 =C2=A0 0 =C2=A0100M =C2=A00 part
=E2=94=94=E2=94=80vdb= 2 252:18 =C2=A0 0 =C2=A09.9G =C2=A00 part
root@vmm-deb:~# pvcreate /dev/= vdb1
=C2=A0 Physical volume "/dev/vdb1" successfully created.<= br>root@vmm-deb:~# pvs
=C2=A0 PV =C2=A0 =C2=A0 =C2=A0 =C2=A0 VG =C2=A0 F= mt =C2=A0Attr PSize =C2=A0 PFree
=C2=A0 /dev/vdb1 =C2=A0 =C2=A0 =C2=A0 = lvm2 --- =C2=A0100.00m 100.00m

2. create a VG
root@vmm-deb:~# vgc= reate virtp /dev/vdb1
=C2=A0 Volume group "virtp" successfully= created
root@vmm-deb:~# vgs
=C2=A0 VG =C2=A0 =C2=A0#PV #LV #SN Attr = =C2=A0 VSize =C2=A0VFree
=C2=A0 virtp =C2=A0 1 =C2=A0 0 =C2=A0 0 wz--n- = 96.00m 96.00m

3. create a lv pool =C2=A0and a over-provisioned volum= e inside it
root@vmm-deb:~# lvcreate -n virtpool -T virtp/virtpool -L40M=
=C2=A0 Logical volume "virtpool" created.
root@vmm-deb:~# = lvs
=C2=A0 LV =C2=A0 =C2=A0 =C2=A0 VG =C2=A0 =C2=A0Attr =C2=A0 =C2=A0 = =C2=A0 LSize =C2=A0Pool Origin Data% =C2=A0Meta% =C2=A0Move Log Cpy%Sync Co= nvert
=C2=A0 virtpool virtp twi-a-tz-- 40.00m =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 0.00 =C2=A0 0.88 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
root@vmm-deb:~# lv= create =C2=A0-V1G -T virtp/virtpool -n vol01
=C2=A0 WARNING: Sum of all = thin volume sizes (1.00 GiB) exceeds the size of thin pool virtp/virtpool a= nd the size of whole volume group (96.00 MiB)!
=C2=A0 For thin pool auto= extension activation/thin_pool_autoextend_threshold should be below 100.=C2=A0 Logical volume "vol01" created.
root@vmm-deb:~# lvs=C2=A0 LV =C2=A0 =C2=A0 =C2=A0 VG =C2=A0 =C2=A0Attr =C2=A0 =C2=A0 =C2=A0 = LSize =C2=A0Pool =C2=A0 =C2=A0 Origin Data% =C2=A0Meta% =C2=A0Move Log Cpy%= Sync Convert
=C2=A0 virtpool virtp twi-aotz-- 40.00m =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 0.00 =C2=A0 0.98 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <= br>=C2=A0 vol01 =C2=A0 =C2=A0virtp Vwi-a-tz-- =C2=A01.00g virtpool =C2=A0 = =C2=A0 =C2=A0 =C2=A00.00 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
---------- Now the operations
# dd if=3D/dev/urandom of=3D./fil status= =3Dprogress
90532864 bytes (91 MB, 86 MiB) copied, 6.00005 s, 15.1 MB/s^= C
188706+0 records in
188705+0 records out
96616960 bytes (97 MB, = 92 MiB) copied, 6.42704 s, 15.0 MB/s

# df -h .
Filesystem =C2=A0 = =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Size =C2=A0Used Avail Use% Mounte= d on
/dev/mapper/virtp-vol01 =C2=A0976M =C2=A0 95M =C2=A0815M =C2=A011% = /tmp/x
# sync
# cd ..
root@vmm-deb:/tmp# umount x
root@vmm-deb:= /tmp# fsck.ext4 -f -C0 =C2=A0/dev/virtp/vol01
e2fsck 1.43-WIP (15-Mar-2= 016)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking dire= ctory structure =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2= =A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0
Pass 3: Checking directory connectivity
Pass 4: Checkin= g reference counts
Pass 5: Checking group summary information
/dev/vi= rtp/vol01: 12/65536 files (8.3% non-contiguous), 36544/262144 blocks =C2=A0=

<mount>
# du -hs fil93M =C2=A0 =C2=A0fil

# dd if=3D./fil of=3D/dev/null status=3Dprogr= ess
188705+0 records in
188705+0 records out
96616960 bytes (97 MB= , 92 MiB) copied, 0.149194 s, 648 MB/s


# vgs
=C2=A0 VG= =C2=A0 =C2=A0#PV #LV #SN Attr =C2=A0 VSize =C2=A0VFree
=C2=A0 virtp =C2= =A0 1 =C2=A0 2 =C2=A0 0 wz--n- 96.00m 48.00m

Definetly the file is o= ccupying 90+MB.

What i expect is that the pool is 40M and the file m= ust NOT exceed 40M. Where does the file get 93M space ?
I know the VG is= 96M but the pool created was max 40M (also VG still says 48M free). Is the= file exceeding the boundaries ?
or am I doing anything wrong ?
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