<div dir="ltr"><div><div>I used this procedure to archive what you need to do.<br><br></div>1: active cmirror on every cluster nodes<br>2: <code>lvconvert -m 1 vg00/lvdata /dev/mapper/mapth1 --corelog #where mpath1 is the new lun<br><br></code></div><code>When the lvdata lv is in sync, now you can the dettach the old lun with<br><br><code>lvconvert -m 0 vg00/lvdata /dev/mapper/mapth0</code><br></code><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-05-23 14:31 GMT+02:00 kAja Ziegler <span dir="ltr"><<a href="mailto:ziegleka@gmail.com" target="_blank">ziegleka@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hi all,<br></div><div><br></div><div> 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)?</div><div><br></div><div>I found these articles in Red Hat knowledgebase:</div><br>- Can I perform a pvmove on a clustered logical volume? - <a href="https://access.redhat.com/solutions/39894" target="_blank">https://access.redhat.com/<wbr>solutions/39894</a><br>- How to migrate SAN LUNs which has Clustered LVM configured on it? - <a href="https://access.redhat.com/solutions/466533" target="_blank">https://access.redhat.com/<wbr>solutions/466533</a><br><div><br></div><div>With regard to the mentioned articles it can be done, i<span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">t is only needed to install and run the cmirror service. Should I expect any problems or other prerequisites?<br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">My clustered environment:</span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">- 8 nodes - CentOS 6.9</span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">- </span></span><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">LVM version: 2.02.143(2)-RHEL6 (2016-12-13)<br> Library version: 1.02.117-RHEL6 (2016-12-13)</span></span><br></div><div> Driver version: 4.33.1<br>- 7 clustered VGs overall<br></div><div>- 1 LV with GFS mounted on all nodes<br></div><div><br></div><div><br></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">- 1 clustered VG with 1 PV and 1 LV on which it is GFS:</span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">[root@...]# pvdisplay /dev/mapper/35001b4d01b1da512<br> --- Physical volume ---<br> PV Name /dev/mapper/35001b4d01b1da512<br> VG Name vg_1<br> PV Size 4.55 TiB / not usable 2.00 MiB<br> Allocatable yes<br> PE Size 4.00 MiB<br> Total PE 1192092<br> Free PE 1115292<br> Allocated PE 76800<br> PV UUID jH1ubM-ElJv-632D-NG8x-jzgJ-<wbr>mwtA-pxxL90<br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">[root@...]# lvdisplay vg_1/lv_gfs<br> --- Logical volume ---<br> LV Path /dev/vg_1/lv_gfs<br> LV Name lv_gfs<br> VG Name vg_1<br> LV UUID OsJ8hM-sH9k-KNs1-B1UD-3qe2-<wbr>6vja-hLsrYY<br> LV Write Access read/write<br> LV Creation host, time ,<br> LV Status available<br> # open 1<br> LV Size 300.00 GiB<br> Current LE 76800<br> Segments 1<br> Allocation inherit<br> Read ahead sectors auto<br> - currently set to 256<br> Block device 253:418<br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-">[root@...]# vgdisplay vg_1<br> --- Volume group ---<br> VG Name vg_1<br> System ID<br> Format lvm2<br> Metadata Areas 1<br> Metadata Sequence No 3898<br> VG Access read/write<br> VG Status resizable<br> Clustered yes<br> Shared no<br> MAX LV 0<br> Cur LV 1<br> Open LV 1<br> Max PV 0<br> Cur PV 1<br> Act PV 1<br> VG Size 4.55 TiB<br> PE Size 4.00 MiB<br> Total PE 1192092<br> Alloc PE / Size 76800 / 300.00 GiB<br> Free PE / Size 1115292 / 4.25 TiB<br> VG UUID PtMo7F-XIbC-YSA0-rCQQ-R1oE-<wbr>g8B7-PiAeIR<br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"></span></span><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div>- 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.<br></div><div><br></div><div><br></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-short_text" lang="en"><span class="m_-4398757846952401978gmail-">Thank you for your opinions and experience.</span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-short_text" lang="en"><span class="m_-4398757846952401978gmail-"><br></span></span></div><div><span id="m_-4398757846952401978gmail-result_box" class="m_-4398757846952401978gmail-short_text" lang="en"><span class="m_-4398757846952401978gmail-">Have a great day and with best regards,</span></span><span class="HOEnZb"><font color="#888888"><br></font></span></div><span class="HOEnZb"><font color="#888888"><div><div><div><div class="m_-4398757846952401978gmail-m_5684586875341332126gmail_signature">-- <br>Karel Ziegler<br><br></div></div> </div></div></font></span></div> <br>______________________________<wbr>_________________<br> linux-lvm mailing list<br> <a href="mailto:linux-lvm@redhat.com">linux-lvm@redhat.com</a><br> <a href="https://www.redhat.com/mailman/listinfo/linux-lvm" rel="noreferrer" target="_blank">https://www.redhat.com/<wbr>mailman/listinfo/linux-lvm</a><br> read the LVM HOW-TO at <a href="http://tldp.org/HOWTO/LVM-HOWTO/" rel="noreferrer" target="_blank">http://tldp.org/HOWTO/LVM-<wbr>HOWTO/</a><br></blockquote></div><br><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"> .~.<br> /V\<br> // \\<br>/( )\<br>^`~'^</div> </div>