topic 12h Autoraid in Disk Enclosures https://community.hpe.com/t5/disk-enclosures/12h-autoraid/m-p/2969314#M8388 I know the way hot to get good performens.<BR />The way is:<BR />1) Create each vg comprised of 2 LUNS of equal size. LUNa should be primary path controller X (alt Y); LUNb should be primary path controller Y (alt X). This utilizes both external SCSI paths for maximum performance. <BR />2) Each lvol should be striped across both LUNS in the volume group for the same reason. <BR />3) As you indicated, run them at about (50-60%) capacity leaving the remainder as unconfigured LUNS. Yes, you waste disk but the performance is worth it. <BR /><BR />But my question is must be the 2 LUNS in the vg of equal size?????<BR /> Thanks Fri, 09 May 2003 10:59:31 GMT 2003-05-09T10:59:31Z 12h Autoraid https://community.hpe.com/t5/disk-enclosures/12h-autoraid/m-p/2969314#M8388 I know the way hot to get good performens.<BR />The way is:<BR />1) Create each vg comprised of 2 LUNS of equal size. LUNa should be primary path controller X (alt Y); LUNb should be primary path controller Y (alt X). This utilizes both external SCSI paths for maximum performance. <BR />2) Each lvol should be striped across both LUNS in the volume group for the same reason. <BR />3) As you indicated, run them at about (50-60%) capacity leaving the remainder as unconfigured LUNS. Yes, you waste disk but the performance is worth it. <BR /><BR />But my question is must be the 2 LUNS in the vg of equal size?????<BR /> Thanks Fri, 09 May 2003 10:59:31 GMT https://community.hpe.com/t5/disk-enclosures/12h-autoraid/m-p/2969314#M8388 2003-05-09T10:59:31Z Re: 12h Autoraid https://community.hpe.com/t5/disk-enclosures/12h-autoraid/m-p/2969315#M8389 See 'man lvcreate'. Striping is done at lvol level. If you will have LUNs of different sizes then you will not be able to stripe lvol across space difference - this means that striped lvol can be of size of the least LUN (in your 2-LUN config, thus '-i 2')<BR />Eugeny Fri, 09 May 2003 11:25:41 GMT https://community.hpe.com/t5/disk-enclosures/12h-autoraid/m-p/2969315#M8389 Eugeny Brychkov 2003-05-09T11:25:41Z