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Old 10-19-2004, 05:33 AM   #1
monkeyleader
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Maxiumum Vol Size


Hey all,

So I have a 3Tb external RAID array attached via SCSI to my Dell2650 box running Fedora Core 2 - Ive create one logical volume using the inbuilt RAID tools - so the volume size is around 2.4tb (after we take of spare disk and leakage etc ) When I boot the system however the SCSI scanning (within the OS) only seem 743Gb and indeed when I mount this volume I only see 743gb ?

Any ideas how I get my box to see the full logical volume ?

ta,
 
Old 10-21-2004, 07:19 PM   #2
finegan
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What filesystem did you write to the partition?

If its ext3, you might have run up against one of the (many) ext3 volume limitation issues. For big huge fatty partitions reiserfs and xfs are the winners. If you can fdisk the volume at its full size then its not an LVM problem... looks fs.

Cheers,

Finegan
 
Old 10-21-2004, 11:17 PM   #3
Shade
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Perhaps you need to reconfigure the kernel with large block device support -- for volumes larger than 2TB, you need this.

--Shade
 
Old 10-22-2004, 04:27 AM   #4
monkeyleader
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So how do I get the kernel to work with volumes greater than 2Tb ? Also when booting the dell bios reports that the volume size it seems is 743gb - surley this shows its something before the linux kernel comes into play ?

Nige
 
Old 10-22-2004, 09:09 AM   #5
monkeyleader
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Here is a bit more information

[root@gondor rd]# fdisk /dev/sda
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.

The number of cylinders for this disk is set to 97049.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): p

Disk /dev/sda: 798.2 GB, 798257840128 bytes
255 heads, 63 sectors/track, 97049 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

Command (m for help):

As you can see its only picking up under 800gb even though the volume is over 2Tb in size.

Nigel
 
Old 10-22-2004, 06:17 PM   #6
finegan
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I just checked FC2's default kernel config, LBD is turned on.

However, under: ATA/ATAPI/MFM/RLL support ->

[ ] Auto-Geometry Resizing support (NEW)

Is off... that's what makes my old AMD 800Mhz box able to see its 250Gb and 200Gb drives. BIOS will report on one drive size to the kernel, and the kernel will ignore it and look for itself.

Cheers,

Finegan
 
  


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