Re: compatibility + jfs

Leo Tick wrote:
> How can a volume be JFS and compatible or do I have no idea as to
> what compatible is

A JFS partition may be LVM or Compatibility.  AFAIK, it must be 
Compatibility to be bootable but Compatibility does not allow some of 
the features that an LVM volume does.  From the command line, enter lvm. 
  You will have to hit <Enter> several times to get through the list of 
physical disks you don't have.  Eventually you get to a list Logical 
Volumes.  <F1> will get you to the Help screens.  <PgDn> twice will
get 
you to Type and a fuller explanation.

How can a volume be JFS and compatible or do I have no idea as to

Leo Tick wrote:
>   LVM can create Compatibility volumes
>  or LVM volumes. Compatibility
>  volumes created by LVM can be
>  marked bootable and are accessible
>  by other operating systems.
>  LVM volumes can be formatted for
>  the JFS file system and can link
>                Notice this line. To me there is a clear implication
>                JFS goes only to LVM volumes but it is not true. Docs
>                do have their problems. I infer that a JFS-compat volume
>                cannot be extended with additional partitions and that
>                is thae limitation.
Where did you find that line?  This is definitely not the case.  On the 
hard drive of this machine, I have four partitions formated with the 
JFS.  Three of these are bootable and being used for various 
incarnations of eCS 2.0.  These are compatable and must be to be 
bootable.  The fourth is  an LVM drive.  This fourth, I use for juggling 
large files such as video and music (FLAC) files.  Note that as well as 
not having a 2GB file size limit, files can be moved or deleted 
essentially instantaneously on the LVM volume.

I also have a few external (USB) removable drives.  These have a 32GB 
FAT32 partition and the remainder JFS partitions.  I had the Devils own 
time getting that to work until I realized that the USB drives could be 
JFS but had to be compatibility drives.

Ted Edwards wrote:
> Leo Tick wrote:
>> How can a volume be JFS and compatible or do I have no idea as to
>> what compatible is
> 
> A JFS partition may be LVM or Compatibility.  AFAIK, it must be 
> Compatibility to be bootable but Compatibility does not allow some of 
> the features that an LVM volume does.  From the command line, enter lvm. 
>  You will have to hit <Enter> several times to get through the list
of 
> physical disks you don't have.  Eventually you get to a list Logical 
> Volumes.  <F1> will get you to the Help screens.  <PgDn> twice
will get 
> you to Type and a fuller explanation.
> 
> Ted

Thank you for your answer just so you do not think me thick I give the 
infor here:
   LVM can create Compatibility volumes
  or LVM volumes. Compatibility
  volumes created by LVM can be
  marked bootable and are accessible
  by other operating systems.
  LVM volumes can be formatted for
  the JFS file system and can link
                Notice this line. To me there is a clear implication
                JFS goes only to LVM volumes but it is not true. Docs
                do have their problems. I infer that a JFS-compat volume
                cannot be extended with additional partitions and that
                is thae limitation.

  multiple partitions into a single

Leo Tick wrote:
> I am sure what you are saying just self-justifying that one could
> be confused by the doc in the Help

Let's face it really good software documentation that does not require a 
lot of outside experience is pretty rare.

> Thanks again. Am planning to movr my system to a JFS compat.

Enjoy!