[ale] one kernel module, multiple devices

[Lightner, Jeff]

Since the controller is presenting the RAID LUNs (virtuals disks) rather than the real physical disks as “disks” to the OS I wouldn’t think you could control it from the OS level at all.   That is to say if you have a RAID 5 LUN comprised of 4 disks on one channel of the LSI controller and a RAID 1 LUN comprised of two disks on the other channel of the LSI controller the OS is actually only seeing 2 “disks” which are actually the two LUNs (a/k/a virtual disks) rather than all 7 physical disks.    That is different from software RAID where you see all the physical disks and assemble them into meta-disks.

The only time I’ve been able to adjust RAID setup on LSI (or Dell’s PERC OEM of same) is during the boot when I enter the BIOS of the adapter itself.   I have seen later versions of Dell BIOS call this as well but that still requires that I did the Dell BIOS during boot up.   I’ve  also seen some view of the PERC setup via Dell OpenManage but as I recall that was more a view than a way to manipulate layout.


From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of Jim Kinney
Sent: Friday, May 16, 2014 1:47 PM
To: Atlanta Linux Enthusiasts - Yes! We run Linux!
Subject: [ale] one kernel module, multiple devices

I have a system with multiple SAS devices. They all are LSI and use the same kernel module - mpt2sas.
I would like to be able to disconnect one device from the module while leaving the other attached and running. This way I can drop a SAS HBA running a tape system so I can power down the tap and pull out a drive with a stuck tap all without disturbing the RAID card and it's mounted files (i.e. the OS!).
I know the PCI bus addresses but have not found a way to unload a shared module without fully unloaded a shared module.
Ideas?

--
--
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you gain at one end you lose at the other. It's like feeding a dog on his own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/



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