From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx09.extmail.prod.ext.phx2.redhat.com [10.5.110.38]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5DAF3608E0 for ; Wed, 23 May 2018 12:31:45 +0000 (UTC) Received: from mail-io0-f177.google.com (mail-io0-f177.google.com [209.85.223.177]) (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 D841114419C for ; Wed, 23 May 2018 12:31:33 +0000 (UTC) Received: by mail-io0-f177.google.com with SMTP id z4-v6so22535777iof.5 for ; Wed, 23 May 2018 05:31:33 -0700 (PDT) MIME-Version: 1.0 From: kAja Ziegler Date: Wed, 23 May 2018 14:31:32 +0200 Message-ID: Content-Type: multipart/alternative; boundary="00000000000005ce53056cdeb7e0" Subject: [linux-lvm] Move LV with GFS to new LUN (pvmove) in the cluster 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 --00000000000005ce53056cdeb7e0 Content-Type: text/plain; charset="UTF-8" Hi all, I want to ask if it is possible and safe to move online the clustered LV with GFS on the one PV (multipathed LUN from the old storage) to an other one (multipathed LUN on the new storage)? I found these articles in Red Hat knowledgebase: - Can I perform a pvmove on a clustered logical volume? - https://access.redhat.com/solutions/39894 - How to migrate SAN LUNs which has Clustered LVM configured on it? - https://access.redhat.com/solutions/466533 With regard to the mentioned articles it can be done, it is only needed to install and run the cmirror service. Should I expect any problems or other prerequisites? My clustered environment: - 8 nodes - CentOS 6.9 - LVM version: 2.02.143(2)-RHEL6 (2016-12-13) Library version: 1.02.117-RHEL6 (2016-12-13) Driver version: 4.33.1 - 7 clustered VGs overall - 1 LV with GFS mounted on all nodes - 1 clustered VG with 1 PV and 1 LV on which it is GFS: [root@...]# pvdisplay /dev/mapper/35001b4d01b1da512 --- Physical volume --- PV Name /dev/mapper/35001b4d01b1da512 VG Name vg_1 PV Size 4.55 TiB / not usable 2.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 1192092 Free PE 1115292 Allocated PE 76800 PV UUID jH1ubM-ElJv-632D-NG8x-jzgJ-mwtA-pxxL90 [root@...]# lvdisplay vg_1/lv_gfs --- Logical volume --- LV Path /dev/vg_1/lv_gfs LV Name lv_gfs VG Name vg_1 LV UUID OsJ8hM-sH9k-KNs1-B1UD-3qe2-6vja-hLsrYY LV Write Access read/write LV Creation host, time , LV Status available # open 1 LV Size 300.00 GiB Current LE 76800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:418 [root@...]# vgdisplay vg_1 --- Volume group --- VG Name vg_1 System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 3898 VG Access read/write VG Status resizable Clustered yes Shared no MAX LV 0 Cur LV 1 Open LV 1 Max PV 0 Cur PV 1 Act PV 1 VG Size 4.55 TiB PE Size 4.00 MiB Total PE 1192092 Alloc PE / Size 76800 / 300.00 GiB Free PE / Size 1115292 / 4.25 TiB VG UUID PtMo7F-XIbC-YSA0-rCQQ-R1oE-g8B7-PiAeIR - IO activity on the PV (LUN) is very low - from iostat and average per node: 2.5 tps , 20.03 Blk_read/s and 0 Blk_wrtn/s in 1 minute. Thank you for your opinions and experience. Have a great day and with best regards, -- Karel Ziegler --00000000000005ce53056cdeb7e0 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: base64 PGRpdiBkaXI9Imx0ciI+PGRpdj5IaSBhbGwsPGJyPjwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+ wqBJIHdhbnQgdG8gYXNrIGlmIGl0IGlzIHBvc3NpYmxlIGFuZCBzYWZlIHRvIG1vdmUgb25saW5l IHRoZSBjbHVzdGVyZWQgTFYgd2l0aCBHRlMgb24gdGhlIG9uZSBQViAobXVsdGlwYXRoZWQgTFVO IGZyb20gdGhlIG9sZCBzdG9yYWdlKSB0byBhbiBvdGhlciBvbmUgKG11bHRpcGF0aGVkIExVTiBv biB0aGUgbmV3IHN0b3JhZ2UpPzwvZGl2PjxkaXY+PGJyPjwvZGl2PjxkaXY+SSBmb3VuZCB0aGVz ZSBhcnRpY2xlcyBpbiBSZWQgSGF0IGtub3dsZWRnZWJhc2U6PC9kaXY+PGJyPi0gQ2FuIEkgcGVy Zm9ybSBhIHB2bW92ZSBvbiBhIGNsdXN0ZXJlZCBsb2dpY2FsIHZvbHVtZT8gLSA8YSBocmVmPSJo dHRwczovL2FjY2Vzcy5yZWRoYXQuY29tL3NvbHV0aW9ucy8zOTg5NCI+aHR0cHM6Ly9hY2Nlc3Mu cmVkaGF0LmNvbS9zb2x1dGlvbnMvMzk4OTQ8L2E+PGJyPi0gSG93IHRvIG1pZ3JhdGUgU0FOIExV TnMgd2hpY2ggaGFzIENsdXN0ZXJlZCBMVk0gY29uZmlndXJlZCBvbiBpdD8gLSA8YSBocmVmPSJo 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