<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:st1="urn:schemas-microsoft-com:office:smarttags" xmlns="http://www.w3.org/TR/REC-html40" xmlns:ns0="urn:schemas-microsoft-com:office:smarttags"> <head> <meta http-equiv=Content-Type content="text/html; charset=iso-8859-1"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="State"/> <o:SmartTagType namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place"/>  <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hi,<o:p></o:p> <o:p> </o:p> I’m testing clustered mirror with RHEL 5.3 and I’m finding weird behavior. I’ve installed and enabled cmirror and created a couple of mirrored logical volumes (after some fight with clvmd errors…):<o:p></o:p> <o:p> </o:p> [root@rmamseslab07 usr]# lvs -a -o +devices<o:p></o:p> lvol8 vg00 -wi-ao 4.00G /dev/cciss/c0d0p2(736) <o:p></o:p> lv_mirror vgcluster mwi-ao 1.00G lv_mirror_mlog 100.00 lv_mirror_mimage_0(0),lv_mirror_mimage_1(0)<o:p></o:p> [lv_mirror_mimage_0] vgcluster iwi-ao 1.00G /dev/mapper/mpath0p2(0) <o:p></o:p> [lv_mirror_mimage_1] vgcluster iwi-ao 1.00G /dev/mapper/mpqdiskp5(512) <o:p></o:p> [lv_mirror_mlog] vgcluster lwi-ao 4.00M /dev/mapper/mpath0p1(0) <o:p></o:p> lv_test1 vgcluster -wi-ao 1.00G /dev/mapper/mpqdiskp5(256) <o:p></o:p> lv_test4 vgcluster mwi-ao 1.00G lv_test4_mlog 100.00 lv_test4_mimage_0(0),lv_test4_mimage_1(0) <o:p></o:p> [lv_test4_mimage_0] vgcluster iwi-ao 1.00G /dev/mapper/mpqdiskp5(0) <o:p></o:p> [lv_test4_mimage_1] vgcluster iwi-ao 1.00G /dev/mapper/mpath0p2(256) <o:p></o:p> [lv_test4_mlog] vgcluster lwi-ao 4.00M /dev/mapper/mpath0p1(1) <o:p></o:p> [root@rmamseslab07 usr]#<o:p></o:p> <o:p> </o:p> I’m simulating the failure of a disk by disabling one of the disks having a mirror leg from the storage array or from dm-multipath and the result I get is not the desired one, simply, any lvm command hangs and filesystem appears as hang as well. After enabling the disk again, everything is recovered.<o:p></o:p> <o:p> </o:p> Is anyone using successfully lvm mirror in a RH cluster with RHEL 5.3 with dm-multipath devices?<o:p></o:p> <o:p> </o:p> Is there any alternative for software mirroring to lvm mirror for RHCS. i.e. VxVM or something like that?<o:p></o:p> <o:p> </o:p> Best regards,<o:p></o:p> <o:p> </o:p> <o:p> </o:p> Alfredo Moralejo Business Platforms Engineering - OS Servers - UNIX Senior Specialist<o:p></o:p> F. Hoffmann-La Roche Ltd.<o:p></o:p> Global Informatics Group Infrastructure Josefa Valcárcel, 40 28027 <ns0:State w:insAuthor="Alfredo Moralejo" w:insDate="2009-08-24T18:04:00Z" w:endInsAuthor="Alfredo Moralejo" w:endInsDate="2009-08-24T18:04:00Z"><st1:State w:st="on">Madrid</st1:State></ns0:State> <ns0:place w:insAuthor="Alfredo Moralejo" w:insDate="2009-08-24T18:04:00Z" w:endInsAuthor="Alfredo Moralejo" w:endInsDate="2009-08-24T18:04:00Z"><ns0:country-region w:insAuthor="Alfredo Moralejo" w:insDate="2009-08-24T18:04:00Z" w:endInsAuthor="Alfredo Moralejo" w:endInsDate="2009-08-24T18:04:00Z"><st1:place w:st="on"><st1:country-region w:st="on">SPAIN</st1:country-region></st1:place></ns0:country-region></ns0:place><o:p></o:p> Phone: +34 91 305 97 87 <o:p></o:p> <a href="mailto:alfredo.moralejo@roche.com">alfredo.moralejo@roche.com</a> <o:p></o:p> Confidentiality Note: This message is intended only for the use of the named recipient(s) and may contain confidential and/or proprietary information. If you are not the intended recipient, please contact the sender and delete this message. Any unauthorized use of the information contained in this message is prohibited. <o:p></o:p> <o:p> </o:p> </div> </body> </html>