What is the size for PE in linux

[joe]

What is the standard size for PE in linux

[frank_fran]

The physical extent size (PE size) of a LVM volume group (VG) is fixed upon the creation of VG. In Linux command line, the -s option switch of vgcreate command is to explicitly set the physical extent size (PE size) on physical volumes (PV) of the volume group (VG). PE size is defaulted to 4MB if it’s not set explicitly. However, once this value has been set, it’s not possible to change a PE size without recreating the volume group which would involve backing up and restoring data on any logical volumes!

As far as LVM2 is concerned – LVM version 2.02.06 (2006-05-12), Library version 1.02.07 (2006-05-11), Driver version 4.5.0 – there is no LVM commands or utilities, not even the vgmodify in HPUX, to resize or change the LVM PE size of an existing VG dynamically or in online mode!

So, it’s recommended to properly plan ahead before creating a LVM volume group. For example, if the logical volume will store database tables where the database size will likely grow up to more than 300G in near future, you should have not created a volume group with the default PE size of 4MB!

[carlhop85]

Hello,


I am Carl.This is my first visit to site.I am new to this site,but I’ve enjoyed posting in your forums.Version 5 Release 1 for Linux commands and applications are compatible with the supported distributions and levels of Linux, but not with earlier versions of Linux. All nodes in a parallel job must run the same versions of PE,Load Leveler,and LAPI at the same maintenance levels. It is recommended that you install and use PE Version 5 Release 1, Load Leveler 3.5, and LAPI 2.4.6 or LAPI 3.1.2 at their latest support levels to provide the latest function.The default size of the point-to-point Early Arrival buffer has been changed from 2.8 MB to 64 MB for 32-bit IP applications. The 2.8 MB used in previous releases can lead to performance problems when the job has more than a few tasks. A side effect of the new default could cause your application to fail due to insufficient memory.Thank you very much and Stay connected with me.

[alein123]

What is the maximum size of a single logical volume (LV) in Linux Logical Volume Manager or LVM? How to resize or change LVM PE size of an existing volume group or VG dynamically?

Most probably you’re here because you’re googling these similar LVM FAQ. Hopefully these are the answers!