<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 11 (filtered medium)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> I’ve been experimenting a bit with dmraid eventing, and I notice that when I do the following, the result is not what I expect – but perhaps someone can enlighten me on what is truly expected:<o:p></o:p> <o:p> </o:p> <ol style='margin-top:0in' start=1 type=1> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>Setup a RAID0+1 with dmraid<o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>Register the RAID using dm_dso_reg_tool. I also ensure that it is properly registerd using “dm_dso_reg_tool –m”.<o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>I note the major and minor number of the devices that comprise the RAID, using “dmsetup status”.<o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>I start a write onto the RAID volume using a large file (3GB).<o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>During the write process, I pull one of the RAID member disks out so that I may simulate a RAID failure.<o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>I notice that the “dmsetup status” command shows one of the disks as being marked disabled – which is good. I take note of the disabled disk’s major:minor numbers. <o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>I reconnect the RAID member disk that I pulled out in step 5. When I look for that disk’s major:minor numbers using “ls –l /dev/sd*”, I don’t see that major:minor number pair. <o:p></o:p></li> <li class=MsoNormal style='mso-list:l0 level1 lfo1'>When I run “dmsetup status” again, the major:minor numbers for the pulled disk is still the same as the one I saw in Step 3.<o:p></o:p></li> </ol> <o:p> </o:p> What I expected was that the major:minor number pair for the pulled disk would correspond to the one that I saw in Step 7. Is my assumption incorrect? The reason why I was expecting it this way was because I was thinking that if I use dmsetup to determine the RAID status and see a disabled drive, I can follow it back to a /dev/sd* and then get the hard drive’s serial number – then I would know which member disk to replace. Is there a better way?<o:p></o:p> <o:p> </o:p> Thanks for clarifying,<o:p></o:p> Sandra<o:p></o:p> </div> </body> </html>