https://community.hpe.com/t5/operating-system-hp-ux/total-pe-not-same-in-2-disk/m-p/3935316#M288015 Although the blocks per disk and size in Kbytes are the same, the firmware revision is different as well as the model number:<BR /> <BR />product id: ST373453LW<BR />rev level: HPC3<BR />product id: ST373207LW<BR />rev level: HPC1<BR /> <BR />So these disks are indeed different. Disk manufacturers have widely varied designs that affect the available sectors reported by the firmware. Although they appear similar, they are different disks internally which may include handling of the inner and outer tracks, and the spare tracks. These disks will be fine to mirror to each other but limit the total size to the smaller size and forget the 10 extra PEs. If they aren't going to be mirrored, just use the all the PEs. Tue, 30 Jan 2007 20:34:24 GMT Bill Hassell 2007-01-30T20:34:24Z https://community.hpe.com/t5/operating-system-hp-ux/total-pe-not-same-in-2-disk/m-p/3935315#M288014 Hello Expert,<BR /> I've a question about the Total PE not same in the 2 same disk. Following are the 2 disk information, on Total PE is 4340, another is 4350. Can anyone knows how to explaiin this?<BR />Is it correct? Thanks.<BR /><BR /><BR /><BR />HP 73.4GST373453LW<BR />HP 73.4GST373207LW<BR /><BR />wtiptop:/#diskinfo -v /dev/rdsk/c0t5d0<BR />SCSI describe of /dev/rdsk/c0t5d0:<BR /> vendor: HP 73.4G<BR /> product id: ST373453LW<BR /> type: direct access<BR /> size: 71687369 Kbytes<BR /> bytes per sector: 512<BR /> rev level: HPC3<BR /> blocks per disk: 143374738<BR /> ISO version: 0<BR /> ECMA version: 0<BR /> ANSI version: 3<BR /> removable media: no<BR /> response format: 2<BR /><BR />gwtiptop:/#diskinfo -v /dev/rdsk/c0t6d0<BR />SCSI describe of /dev/rdsk/c0t6d0:<BR /> vendor: HP 73.4G<BR /> product id: ST373207LW<BR /> type: direct access<BR /> size: 71687369 Kbytes<BR /> bytes per sector: 512<BR /> rev level: HPC1<BR /> blocks per disk: 143374738<BR /> ISO version: 0<BR /> ECMA version: 0<BR /> ANSI version: 3<BR /> removable media: no<BR /> response format: 2<BR /><BR />--- Physical volumes ---<BR /> PV Name /dev/dsk/c0t6d0<BR /> PV Status available<BR /> Total PE 4340<BR /> Free PE 298<BR /> Autoswitch On<BR /><BR /> PV Name /dev/dsk/c0t5d0<BR /> PV Status available<BR /> Total PE 4350<BR /> Free PE 308<BR /> Autoswitch On<BR /> Tue, 30 Jan 2007 20:08:24 GMT https://community.hpe.com/t5/operating-system-hp-ux/total-pe-not-same-in-2-disk/m-p/3935315#M288014 j773303 2007-01-30T20:08:24Z https://community.hpe.com/t5/operating-system-hp-ux/total-pe-not-same-in-2-disk/m-p/3935316#M288015 Although the blocks per disk and size in Kbytes are the same, the firmware revision is different as well as the model number:<BR /> <BR />product id: ST373453LW<BR />rev level: HPC3<BR />product id: ST373207LW<BR />rev level: HPC1<BR /> <BR />So these disks are indeed different. Disk manufacturers have widely varied designs that affect the available sectors reported by the firmware. Although they appear similar, they are different disks internally which may include handling of the inner and outer tracks, and the spare tracks. These disks will be fine to mirror to each other but limit the total size to the smaller size and forget the 10 extra PEs. If they aren't going to be mirrored, just use the all the PEs. Tue, 30 Jan 2007 20:34:24 GMT https://community.hpe.com/t5/operating-system-hp-ux/total-pe-not-same-in-2-disk/m-p/3935316#M288015 Bill Hassell 2007-01-30T20:34:24Z