Brian wrote:
>
> On Mon, 3 Jan 2000, Cokey de Percin wrote:
>
> > Brian wrote:
> > >
> > > no
> > >
> > > On Sun, 2 Jan 2000, Kevin Diffily wrote:
> > >
> > > > I have a current RAID Array (Level 0) that I would like to increase
> > > > in size. Is it possible to add another disk non destructively or
> > > > will I need to rebuild the array and restore the data?
> > > >
> >
> > Hmmmm... Not necessarily true. There isn't enough info to give a good
> > answer. If this is software raid, then probably not. If this is
> > hardware raid then maybe.
> >
> > There's two parts to this:
> >
> > 1) can a device be added to the raid group and the raid group extended
> > across it.
> >
> > a) for software raid, if you're using LVM (Logical Volume Manager)
> > then yes you can add a device, if not then no.
> >
>
> LVM? clue me in, what is lvm and how does it work with raidtools?
LVM stands for Logical Volume Manager as HPUX and AIX have. The current
version for Linux (AFAIK) works like the HPUX varient. What this does,
in software,is to allow groups of physical devices to be viewed as one
logical devicemuch like linear mode under raid tools except it allows the
addition of devices and storage groups. I believe that in some implementations
it is possible to run some types of software raid on top
of it. Some LVMs have file system extension features also.
>
> > b) for hardware raid, depends on the manufacturer. My Mylex
> > Acceleraid allows additional devices added after the raid group
> > is built. Other Manuf. do also.
>
> yes, DPT, Mylex, etc. But do they have it with support for linux. For
> example, the Mylex Xtreme RAID 1100, yes you can, in the bios, add a drive
> to an existing RAID. But how does the operating system handle the
> geometry of the disk changing like that, how does it deal with it?
>
> We have xtremeraid 1100 controllers and DPT SmartRaid V controllers, but
> have you actually expanded a raid and gotten it to work under linux?
>
See my other comment. You need a tool, such as ext2resize (see freshmeat or
www.dsv.nl/~buytenh/ext2resize), to expand the file system. This is just one of
two or three such tools that currently exists.
> >
> > 2) is there a way to extend the file system
> >
> > a) there is a utility called ext2extend (I think that's the name)
> > that allows a file system to be expanded or contracted. Note that
> > it's beta (alpha?) but seems to work. See Freshmeat for the current
> > rev
> > 1.06. I seem to remember another, but cann't remember the name
> > right now.
> >
> > This may not do you any good in this instance, but you might consider some
> > of the possiblities these present in your future planning.
> >
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