https://community.hpe.com/t5/operating-system-hp-ux/lv-mirror/m-p/5362433#M535565 <P>I have a logical volume which had 10 disks. I had to move this LV to another SAN and so I allocated 10 disks from the other san but unfortunately, Because of the VG characteristics, I can only have a max of 16 disks. I ended by migrating data from 5 disks. But with this approach, Performance was so bad that I had to stop it. Now My question is can I mirror the PE on a particular PV to another PV and then break the mirror ? .</P><P>&nbsp;</P><P>--- Logical volumes ---<BR />LV Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /dev/vg05/lvol1<BR />VG Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /dev/vg05<BR />LV Permission&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; read/write&nbsp;&nbsp;<BR />LV Status&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; available/syncd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Mirror copies&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Consistency Recovery&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MWC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Schedule&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parallel&nbsp;&nbsp;&nbsp;&nbsp;<BR />LV Size (Mbytes)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 68000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Current LE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17000&nbsp;&nbsp;&nbsp;&nbsp;<BR />Allocated PE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Stripes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Stripe Size (Kbytes)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Bad block&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; off&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Allocation&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strict&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />IO Timeout (Seconds)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; default&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P><P>&nbsp;&nbsp; --- Distribution of logical volume ---<BR />&nbsp;&nbsp; PV Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LE on PV&nbsp; PE on PV&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d0&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d1&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d4&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d5&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d6&nbsp;&nbsp; 1097&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1097&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t2d7&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d0&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d1&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d2&nbsp;&nbsp; 2130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d3&nbsp;&nbsp; 512&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 512&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>The c19 is all old disks currently in use and c27 is all new disks which are from the new san. The goal is to remove the remaining 5 disks from c19 . Thanks for any input .</P> Fri, 14 Oct 2011 15:24:49 GMT Anand_Sree 2011-10-14T15:24:49Z https://community.hpe.com/t5/operating-system-hp-ux/lv-mirror/m-p/5362433#M535565 <P>I have a logical volume which had 10 disks. I had to move this LV to another SAN and so I allocated 10 disks from the other san but unfortunately, Because of the VG characteristics, I can only have a max of 16 disks. I ended by migrating data from 5 disks. But with this approach, Performance was so bad that I had to stop it. Now My question is can I mirror the PE on a particular PV to another PV and then break the mirror ? .</P><P>&nbsp;</P><P>--- Logical volumes ---<BR />LV Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /dev/vg05/lvol1<BR />VG Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; /dev/vg05<BR />LV Permission&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; read/write&nbsp;&nbsp;<BR />LV Status&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; available/syncd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Mirror copies&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Consistency Recovery&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MWC&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Schedule&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parallel&nbsp;&nbsp;&nbsp;&nbsp;<BR />LV Size (Mbytes)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 68000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Current LE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17000&nbsp;&nbsp;&nbsp;&nbsp;<BR />Allocated PE&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 17000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Stripes&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Stripe Size (Kbytes)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Bad block&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; off&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />Allocation&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; strict&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />IO Timeout (Seconds)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; default&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P><P>&nbsp;&nbsp; --- Distribution of logical volume ---<BR />&nbsp;&nbsp; PV Name&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; LE on PV&nbsp; PE on PV&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d0&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d1&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2157&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d4&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d5&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1280&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c19t3d6&nbsp;&nbsp; 1097&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1097&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t2d7&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d0&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d1&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2129&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d2&nbsp;&nbsp; 2130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2130&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR />&nbsp;&nbsp; /dev/dsk/c27t3d3&nbsp;&nbsp; 512&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 512&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P><P>&nbsp;</P><P>&nbsp;</P><P>The c19 is all old disks currently in use and c27 is all new disks which are from the new san. The goal is to remove the remaining 5 disks from c19 . Thanks for any input .</P> Fri, 14 Oct 2011 15:24:49 GMT https://community.hpe.com/t5/operating-system-hp-ux/lv-mirror/m-p/5362433#M535565 Anand_Sree 2011-10-14T15:24:49Z https://community.hpe.com/t5/operating-system-hp-ux/lv-mirror/m-p/5362477#M535566 <P>Hi:</P><P>&nbsp;</P><P>With 'lvextend' you can specify a partiular physical volume as the target for a mirror as long as the allocation policies ('strict') are observed.&nbsp; After all, you never want mirror copies on the same physical disk.&nbsp; See the 'lvextend' manpages for more information.</P><P>&nbsp;</P><P>I have done many SAN-to-SAN migrations by mirroring from the old to the new SAN and then reducing the mirror from the old when done.&nbsp; This works very well.</P><P>&nbsp;</P><P>If LVM geometry (e.g. 'max_pv') is a concern, look at 'vgmodify' to change that.</P><P>&nbsp;</P><P>Mirror operations do degrade performance somewhat, but it only hurts for a little while :-)</P><P>&nbsp;</P><P>Regards!</P><P>&nbsp;</P><P>...JRF...</P><P>&nbsp;</P><P>&nbsp;</P> Fri, 14 Oct 2011 16:28:22 GMT https://community.hpe.com/t5/operating-system-hp-ux/lv-mirror/m-p/5362477#M535566 James R. Ferguson 2011-10-14T16:28:22Z