I just installed SuSE 9.0 on a dual Opteron file server. It has a 4 TB
SATA raid attached by Fibre through a Qlogic 2312 HBA. I had issues with
the hardware RAID set up (not related to SuSE), originally intending to
have a single 3.5TB device (RAID5), but ended up with 2 logical raid
devices, which appear to SuSE as /dev/sda (2TB) and /dev/sdb (1.5TB). It
takes 20 hours for the RAID to build so I don't want to change that now.
So, in order to combine the space (and allow for future expansion) I set
up LVM. I created a volume group that includes both physical volumes,
then attempt to create logical volumes. Actually, when creating the
volume group there is already a warning that the logical volume size is
limited to 2 TB. I have read conflicting information about this. In
some places, it says that this is due to the maximum block device size
in 2.4 kernels is 2TB, in some places, I read that there is a 2TB limit
imposed by 32 bit hardware (but hey, this is 64 bit hardware!). Isn't
LVM supposed to get around block device limits? Also, I am using JFS
for the file system, so that should not be limiting. When creating the
volume group I used 256 MB physical extents (the default is 32) , so
that should allow larger logical volumes.
So, I create 2 logical volumes, lvol1 (2TB) and lvol2 (1.5TB), and
create a JFS file system on each. In both cases, mkfs.jfs reports the
file system created sucessfully. Now, I can mount lvol1, but when I try
to mount lvol2, it says "wrong fs type, bad option, bad superblock, or
too many mounted filesystems" Well, the mount parameters are the same
for both logical volumes (different mount points), and they are both
freshly created filesystems, so the only possibility seems is that there
are too many mounted filesystems. But, the only other file system that
is mounted is the IDE boot disk, which contains the OS, /home, etc. all
in a single partition, plus /dev/shm.
Is there a kernel parameter I can tweak to allow me to mount more drive
space? 2TB is nothing any more (haha).
Any help will be apreciated.