*** Reply to note of Fri, 10 Jun 2005 08:32:46 -0400 (EDT) *** by [email protected]
The nice thing about LVM is that you can change the DASD addresses (disk letters) and still works as each physical LVM volume gets it own unique id (uuid). For example if you have an LVM group with 2 disks, dasdt1 (400) and dasdu1 (401), you can change them to dasdv1(402) and dasdx1(404) with no problems. Sal Neale Ferguson <[EMAIL PROTECTED]> writes: >Change the order of dasd= in zipl.conf so that the new minidisk is last >in the list so that the existing disks don't get their ids changed. > >-----Original Message----- >At a customer site yesterday I found something that's either an amazing >level of fragility in LVM or else I'm just not understanding it. (This >is LVM V1; I understand V2 is a complete rewrite and probably avoids >this, but that doesn't help with production on older 2.4 kernels.) > >They had a logical volume created from (say) dasdt1, dasdu1, dasdv1. >Then we added a minidisk at a lower virtual address. > >This "pushed" the existing minidisks "down", so the virtual devices in >the LVM were now dasdu1, dasdv1, dasdw1! > >So I have several questions: >1) Have others observed this, or did we do something weird? >2) Is there an easy way to recover? >3) Is there another way to address the devices -- one of our guys >suggested /dev/dasd/4001, /dev/dasd/4002, etc. instead of /dev/dasdt1, >/dev/dasdu1, etc. (I plan to try this today, but thought I'd ask). >4) If the previous suggestion works, is there a reasonable way to change >an existing LVM from the 'old' addressing scheme to the 'new' one? > >---------------------------------------------------------------------- >For LINUX-390 subscribe / signoff / archive access instructions, >send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit >http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
