Re: Expand a raid volume

[kalinix <calin.kalinix.cosma@gmail.com>]

On Wed, 2006-05-17 at 12:31 +0100, Dermot Paikkos wrote:
> So from what I've read so far, there is no way to do an on-line 
> expansion of the filesystem, I have to destroy the current 
> filesystem, create it a new and restore the data. Not what I had 
> hoped for when I bought a RAID card that does on-line expansion!
> 
> > > It I do fdisk /dev/sda5 doesn't show me the same information, and
> > > doesn't list any size. The filesystem is ext3.
> 
> As I don't seem to have a choice and I have to re-create the volume, 
> would it be possible to use LVM on that that volume alone 
> (/dev/sda5)?
> 
> I was under the impression that LVM was a software RAID system and I 
> wanted to use hardware RAID, did I get that wrong too?
> 
> Here's my current filesystem:
> /dev/sda2               26G    11G    14G  45% /
> /dev/sda1              104M    17M    82M  17% /boot
> /dev/shm               1.1G      0   1.1G   0% /dev/shm
> /dev/sda6              107M      0   107M   0% /dos
> /dev/sda5              681G   611G    35G  95% /data
> 
> OS: Fedora Core release 4 (Stentz)
> 
> The plan is to slowly increase the available size on this server so I 
> want to swap the 174GB SCSI disks for 300GB ones. 
> 
> Should I recreate the whole system from scratch and use LVM?
> 
> Sorry I am looking for a few quick answers before reading all of 
> http://www.tldp.org/HOWTO/LVM-HOWTO/index.html
> 
> TIA.
> Dp.
> 
> 
> 
> 
> 
> On 16 May 2006 at 14:24, Tom Callahan wrote:
> 
> > Is partition 5 the last partition on that disk? If it is, you
> > theoretically can just delete partition 5, and then recreate it with a
> > bigger size. MAKE SURE TO TAKE A BACKUP FIRST....JUST IN CASE.
> > 
> > This is why LVM is your friend....If you had /dev/sda as a PV, and
> > then multiple VG's under that, with LV's under that....You could add
> > the disk, resize the PV, resize the VG and LV's and then resize the
> > filesystem, without making changes to the partition tables.
> > 
> > Thanks,
> > Tom Callahan
> > 
> > 
> > 
> > > On Tue, 2006-05-16 at 13:43 -0400, Dermot Paikkos wrote: 
> > > > Hi Admins,
> > > > 
> > > > I have a server with an Adaptec 2120S Raid controller. There are
> > > > were 6 x 174GB disks and one hot spare. I moved the hotspare into
> > > > the RAID 5 volume and the Adaptec Storage Manager shows the volume
> > > > has grown from 681 to 821GB. 
> > > > 
> > > > My problem is that the OS doesn't see it that way. If I remount
> > > > the volume it is still seen as a 681Gb volume.
> > > > 
> > > > /dev/sda5              681G   608G    38G  95% /data
> > > > 
> > > > It I do fdisk /dev/sda5 doesn't show me the same information, and
> > > > doesn't list any size. The filesystem is ext3.
> > > > 
> > > > Disk /dev/sda5: 705.4 GB, 705416431104 bytes
> > > > 255 heads, 63 sectors/track, 85761 cylinders
> > > > Units = cylinders of 16065 * 512 = 8225280 bytes
> > > > 
> > > >      Device Boot      Start         End      Blocks   Id  System
> > > > 
> > > > When I tried to write the new disk label it failed
> > > > 
> > > > Calling ioctl() to re-read partition table.
> > > > 
> > > > WARNING: Re-reading the partition table failed with error 22:
> > > > Invalid argument. The kernel still uses the old table.
> > > > 
> > > > Does anyone know what I need to do to expand the current volume?
> > > > Is it possible? 
> 
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Maybe ext2online could help.



Calin

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