<div dir="ltr"><div class="im" style="font-family:arial,sans-serif;font-size:13px"><div>Hello,</div><div> </div><div>Kernel:</div><div>3.10.0-123.6.3.el7.x86_64 #1 SMP Wed Aug 6 21:12:36 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux </div><div> </div><div>Issue:</div>In trying to set up the new LVM caching, I've run into some issues. I have followed the steps in the lvm manual:<div> </div></div><div style="font-family:arial,sans-serif;font-size:13px"> <div class="im"> 0. Create an origin LV we wish to cache (yours may already exist) # lvcreate -L 10G -n lvx vg /dev/slow </div> Already Exists<div class="im"> 1. Create a cache data LV # lvcreate -L 1G -n lvx_cache vg /dev/fast </div> [root@cheeseboy mysql_python]# vgextend dataraid10 /dev/md30 /dev/md31 /dev/md32 /dev/md33 /dev/md34 [root@cheeseboy mysql_python]# lvcreate -i 5 -I 32 -l 100%FREE -n dataraid10ssdcache dataraid10 Logical volume "dataraid10ssdcache" created<div class="im"> 2. Create a cache metadata LV # lvcreate -L 8M -n lvx_cache_meta vg /dev/fast </div> [root@cheeseboy mysql_python]# vgextend dataraid10 /dev/md35 [root@cheeseboy mysql_python]# lvcreate -i 1 -I 32 -L 20G -n dataraid10metadata dataraid10 Ignoring stripesize argument with single stripe Logical volume "dataraid10metadata" created<div class="im"> 3. Create a cache pool LV specifying cache mode "writethrough" # lvconvert --type cache-pool --poolmetadata vg/lvx_cache_meta \ --cachemode writethrough vg/lvx_cache </div> [root@cheeseboy mysql_python]# lvconvert --type cache-pool --poolmetadata dataraid10/dataraid10metadata --cachemode writethrough dataraid10/dataraid10ssdcache Converted dataraid10/dataraid10ssdcache to cache pool.<div class="im"> 4. Create a cache LV by combining the cache pool LV and origin LV # lvconvert --type cache --cachepool vg/lvx_cache vg/lvx </div> [root@cheeseboy mysql_python]# lvconvert --type cache --cachepool dataraid10/dataraid10ssdcache dataraid10/dataraid10one dataraid10/dataraid10one is now cached. [root@cheeseboy mysql_python]# vgchange -a y dataraid10 [==> causes crash]</div><div class="im" style="font-family:arial,sans-serif;font-size:13px"><div> </div><div>All the above steps seem to run perfectly fine. The issue arises when I try to activate the volume group after. Every time an activation is attempted the box crashes. Everything works fine once I revert back to before the cache was implemented.</div> <div> </div><div>Additional info: </div><div> </div></div><div style="font-family:arial,sans-serif;font-size:13px">PVSCAN</div><div class="im" style="font-family:arial,sans-serif;font-size:13px"><div>Not sure whether related but running pvscan results in the following:</div> <div> </div></div><div style="font-family:arial,sans-serif;font-size:13px">[root@cheeseboy mysql_python]# pvscan No device found for PV gjmSco-2SdO-5uwL-lSQD-nwYo-fUE1-REYBQ4. No device found for PV OnYrCH-Qfv0-AMdo-7IKv-bd6L-FgMk-bvQALX. No device found for PV cpuPLk-GZWG-hcz4-4Byc-jFVH-d2o3-zT1Yn1. No device found for PV dzvkpM-CLSx-UdJG-RUP4-aazN-Ew8Y-z5ePLc. No device found for PV 0c7AOC-Ulj3-tHKs-XfLz-1Mgc-AzEn-dOFQJx. No device found for PV HDPYYO-Us7J-wpfM-718x-D32U-IEXg-J8tDTa. No device found for PV h6F3OG-u3Bm-yjwX-rDe3-xfvm-KxtW-bZa0Zv. No device found for PV R0rajR-2os4-3z6g-TWur-6NR5-B5SE-4frydn. No device found for PV 7aNXGY-uEOp-54Vc-GWZl-yhEn-DGOG-D8IqDe. . . . </div><div style="font-family:arial,sans-serif;font-size:13px">lvdisplay does not show logical volumes: [root@cheeseboy mysql_python]# lvdisplay No device found for PV gjmSco-2SdO-5uwL-lSQD-nwYo-fUE1-REYBQ4. No device found for PV OnYrCH-Qfv0-AMdo-7IKv-bd6L-FgMk-bvQALX. No device found for PV cpuPLk-GZWG-hcz4-4Byc-jFVH-d2o3-zT1Yn1. No device found for PV dzvkpM-CLSx-UdJG-RUP4-aazN-Ew8Y-z5ePLc. No device found for PV 0c7AOC-Ulj3-tHKs-XfLz-1Mgc-AzEn-dOFQJx. No device found for PV HDPYYO-Us7J-wpfM-718x-D32U-IEXg-J8tDTa. No device found for PV h6F3OG-u3Bm-yjwX-rDe3-xfvm-KxtW-bZa0Zv. No device found for PV R0rajR-2os4-3z6g-TWur-6NR5-B5SE-4frydn. No device found for PV 7aNXGY-uEOp-54Vc-GWZl-yhEn-DGOG-D8IqDe. No device found for PV 2GmnAa-b54k-P9kx-LS4t-ZVsq-aMt1-3Eaor2. No device found for PV xyRCY0-SnWX-HZXw-t6rj-J8lK-bnhc-2WOh0f. No device found for PV L2dFmg-3vo3-Qgzp-cke5-WQAA-2jo3-hYGSR1. No device found for PV E52f7l-zIdM-xJCH-Bv3i-Bz59-HXrY-r1dKqU. No device found for PV s5M4FU-JW1J-24rU-Jrko-LisL-XceJ-ESxZYx. No device found for PV 95bymI-HufG-WuPZ-xRfF-XU2v-vgoE-8T1vTZ. No device found for PV mflwNJ-PNDc-iUAJ-2g4J-zMM3-bFBM-4rdnhI. No device found for PV iiHFY6-fcco-DTZI-z9Qd-3lDu-lp1p-8BRfED. No device found for PV 11wo7e-0uyN-PMUY-Ghf2-4lIK-hAOM-A9yjkK. No device found for PV F9BOg5-Teoj-JZhM-ceXi-acFe-tjFi-aP9NYb. PV WtZGHQ-aa5r-WvSh-1GHN-uxMu-G9Mu-jy67Hs not recognised. Is the device missing? No device found for PV XQHcKW-3vGk-6hSJ-6XQm-U3EO-U2I9-KeQJ2b. No device found for PV jdzvH3-dtdp-YAWB-924q-vklQ-ecSz-HEqxls. No device found for PV AGvbXF-p5N5-18Wy-VsUa-Nc23-o5Xc-CRFAWW. No device found for PV rj4zVq-1NFN-r3Pv-PH2L-mj1j-MAss-0308eY. No device found for PV vHThPr-Z2e6-4pHW-2OvI-32f6-IbvZ-Gibrni. No device found for PV guPIc9-q8t8-hdCv-33Us-0REQ-iNlG-gkR4yP. --- Logical volume --- LV Path /dev/centos_cheeseboy/root LV Name root VG Name centos_cheeseboy LV UUID 6WOyCP-nBHy-Uigl-Md0Q-E0hf-ef01-2pnE1S LV Write Access read/write LV Creation host, time localhost, 2014-08-14 10:39:43 -0400 LV Status available # open 1 LV Size 100.03 GiB Current LE 25607 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/centos_cheeseboy/swap LV Name swap VG Name centos_cheeseboy LV UUID DAmiIx-El4e-8Ykl-lOY9-74LS-Ovzg-h2Lye4 LV Write Access read/write LV Creation host, time localhost, 2014-08-14 10:39:44 -0400 LV Status available # open 2 LV Size 11.18 GiB Current LE 2862 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1<div class="im"> I am able to get around this by running the "pvscan --cache" command. </div>[root@cheeseboy mysql_python]# pvscan --cache /dev/md* [root@cheeseboy mysql_python]# lvdisplay --- Logical volume --- LV Path /dev/centos_cheeseboy/root LV Name root VG Name centos_cheeseboy LV UUID 6WOyCP-nBHy-Uigl-Md0Q-E0hf-ef01-2pnE1S LV Write Access read/write LV Creation host, time localhost, 2014-08-14 10:39:43 -0400 LV Status available # open 1 LV Size 100.03 GiB Current LE 25607 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/centos_cheeseboy/swap LV Name swap VG Name centos_cheeseboy LV UUID DAmiIx-El4e-8Ykl-lOY9-74LS-Ovzg-h2Lye4 LV Write Access read/write LV Creation host, time localhost, 2014-08-14 10:39:44 -0400 LV Status available # open 2 LV Size 11.18 GiB Current LE 2862 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Logical volume --- LV Path /dev/dataraid10/dataraid10one LV Name dataraid10one VG Name dataraid10 LV UUID wxexCz-Bt86-JT8d-4iFa-esYy-vDqX-LRdfZO LV Write Access read/write LV Creation host, time <a href="http://cheeseboy.adverplex.com/" target="_blank">cheeseboy.adverplex.com</a>, 2014-08-18 10:27:10 -0400 LV Status NOT available LV Size 27.84 TiB Current LE 7297020 Segments 1 Allocation inherit Read ahead sectors auto --- Logical volume --- LV Path /dev/dataraid10/dataraid10two LV Name dataraid10two VG Name dataraid10 LV UUID bRxXOb-44NS-DpvG-kwlt-Pqb4-ikrS-57sIS5 LV Write Access read/write LV Creation host, time <a href="http://cheeseboy.adverplex.com/" target="_blank">cheeseboy.adverplex.com</a>, 2014-08-18 10:29:05 -0400 LV Status NOT available LV Size 16.24 TiB Current LE 4256595 Segments 1 Allocation inherit Read ahead sectors auto --- Logical volume --- LV Path /dev/dataraid10/tmpdir LV Name tmpdir VG Name dataraid10 LV UUID xA6k4n-sDfH-Cnuc-SL1e-jrTZ-s1xW-cxzXvt LV Write Access read/write LV Creation host, time <a href="http://cheeseboy.adverplex.com/" target="_blank">cheeseboy.adverplex.com</a>, 2014-08-18 10:41:27 -0400 LV Status NOT available LV Size 405.26 GiB Current LE 103747 Segments 1 Allocation inherit Read ahead sectors auto --- Logical volume --- LV Path /dev/dataraid10/dataraid10ssdcache LV Name dataraid10ssdcache VG Name dataraid10 LV UUID 2xhgEd-OLMK-Zwgp-4FgT-5Ncw-msJf-zyLWLa LV Write Access read/write LV Creation host, time <a href="http://cheeseboy.adverplex.com/" target="_blank">cheeseboy.adverplex.com</a>, 2014-08-25 11:06:26 -0400 LV Status NOT available LV Size 3.87 TiB Current LE 1013475 Segments 1 Allocation inherit Read ahead sectors auto I've read that disabling the lv2-lvmetad daemon might yield some results. This did not change the outcome. [root@cheeseboy ~]# service lvm2-lvmetad stop Redirecting to /bin/systemctl stop lvm2-lvmetad.serviceWarning: Stopping lvm2-lvmetad.service, but it can still be activated by: lvm2-lvmetad.socket [root@cheeseboy ~]# systemctl stop lvm2-lvmetad.socket[root@cheeseboy ~]# </div><div> </div>-- <div dir="ltr">Elvin</div> </div>