No disks on Fujitsu Primergy rx 300 s2 -- while raid enabled

Januszzz

I'm just trying to set up Fujitsu Primergy rx300s2. The problem is that while raid is enabled in BIOS I can not find any /dev/sdX devices.

Does anyone knows a solution? What kind of tool do I need to maintain RAID devices in the system?

NeddySeagoon · Posted: Fri May 05, 2006 1:29 pm Post subject:

Januszzz,

There are three sorts of raid known to Linux

If you have the bus bandwidth to support it, hardware raid is the best.
Kernel software raid should be selected over BIOS software raid as its more reliable and can be moved around various hardware configurations.
Fake raid should only be used where linux and windows both need to access the raid set.

Tell us what you need, so we can guide you in the right direction.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Januszzz · Posted: Sun May 07, 2006 9:24 am Post subject:

Sorry for incomplete information, this was because of hurry.

I was to create hardware raid using four 140gb U320 SCI disks. Start CD delivered with the Fujitsu box includes software alleviating creation of RAIDs, so I started it. It proposed me only RAID 5, because all of my 4 disk are attached to one channel. That was ok for me, so I created one logical volume of size 3x140gb.

The problems is while this array is enabled in the computer BIOS, I cannot find any sdaX device. The SCSI controller is LSI Megaraid, and I can see appriopiate module loaded while issuing lsmod.

Do I need a special software which I was not aware of? I assume I've got it already on the Gentoo CD or sth is wrong with the RAID as it should be transparent for system? I can say that also none of other linuxes detected a disk (tried knoppix, rhel and suse).

Besides: can I create 2 logical volumes, of 140gb size, each composed with 2 physical disk (mirrored) with all four disk attached to one channel? these are hot-swaps, but all hot -swap "bays" are attached to one channel (if I'm to attach anything to second channel I would need to buy new cable, so I'm asking before...)

I would appreciate any suggestion.

NeddySeagoon · Posted: Sun May 07, 2006 12:55 pm Post subject:

Januszzz,

It looks like your LSI Megaraid is a real hardware raid card, so each raid set you have will appear as a single SCSI device to the kernel.

Without knowing which card you have, I can only suggest you need one of

Januszzz · Posted: Wed May 10, 2006 7:30 am Post subject: solved.

Ok, I've resolved the problem.

Lack of disks in my system was because of improper connection of cables inside the box. There were two cables - one connected correctly, but the second was without terminator. One of the four disks was working - surprisingly - only at 160MB/s so I tried to discover why - switched cables and it helped.

Now everything works perfectly.

Next time I'll better double check these things before asking. Anyway - thanks for reply.