Thank you for the excellent explanation!
http://www.gagme.com/greg/linux/raid-lvm.php from this link I read "The maximum number of physical extents is approximately 65k so take your maximum volume size and divide it by 65k then round it to the next nice round number. " looks like I already have Total PE 953799 this is bigger than 65k, does anyone know the current maximum number PE in debian lenny? Jim On 19 March 2011 22:15, Gregory Seidman <gsslist+deb...@anthropohedron.net> wrote: > On Sat, Mar 19, 2011 at 10:02:24PM -0400, Jim Green wrote: >> this is what I have from fdisk -l, I have lvm on /dev/md1, md1 is a >> raid10 array with 4x2T drives. >> Disk /dev/md1: 4000.5 GB, 4000525058048 bytes >> 2 heads, 4 sectors/track, 976690688 cylinders >> Units = cylinders of 8 * 512 = 4096 bytes >> Sector size (logical/physical): 512 bytes / 512 bytes >> I/O size (minimum/optimal): 524288 bytes / 2097152 bytes >> Disk identifier: 0x00000000 > > Note that 4000525058048 != 4 x 2^40 (4398046511104) > >> this is what I have from pvdisplay >> --- Physical volume --- >> PV Name /dev/md1 >> VG Name 2600k >> PV Size 3.64 TiB / not usable 0 >> Allocatable yes >> PE Size 4.00 MiB >> Total PE 953799 >> Free PE 831052 >> Allocated PE 122747 >> PV UUID WUpkTR-xyCK-HGOc-Hk7Q-OfBp-Mqsz-GubCy7 > > 2^40 = 1099511627776 > > 4000525058048 / 1099511627776 = 3.6384563446044921875 ~= 3.64 > >> I don't know why I only have a 3.64T pv size, it should be 4T I think, >> in the installation of lenny i use ext3 for all the partitions, >> also I set the unused space for each partition as 1%. >> >> Thank you if you have an explanation or if you have ways to reclaim >> the 0.36 T from my arrays. > > The difference is between what vendors use to describe their drives (TB, > meaning trillions of bytes) and what sane computer systems use (TiB, > meaning 2^40 bytes). > >> Jim > --Greg > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org > Archive: http://lists.debian.org/20110320021554.ga29...@anthropohedron.net > > -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/AANLkTinQ=5oZdBVrc0X48ojS8KmsFTEgGgCcxsUQ69=t...@mail.gmail.com
