[ale] one kernel module, multiple devices

[Jim Kinney]

I see what you're saying. I have 2 different controller cards however. One
is a RAID the other is an HBA. But they both use the same driver. I have
software that lets me control the RAID array through the card but an HBA is
"dumb" of sorts. It's best to disconnect the HBA from the tape system
before powering down the tape system but I don't think I can do that
without unloading the kernel module which will force a disconnect from the
RAID array (so I may as well power down the entire system - grr).


On Fri, May 16, 2014 at 2:04 PM, Lightner, Jeff <JLightner at dsservices.com>wrote:

>   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/
> <http://heretothereideas.blogspot.com/>*
>
>
>
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-- 
-- 
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/
<http://heretothereideas.blogspot.com/>*
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