[ale] one kernel module, multiple devices

[Jim Kinney]

Yep. LTO6 tape library uses dual SAS drives. SCSI is dead. I can do
multipath for control but not data to tape. The each have their own 4 lane
SAS connection. The control is for the changer.
On May 16, 2014 3:51 PM, "Lightner, Jeff" <JLightner at dsservices.com> wrote:

>  Are you sure your “HBA” is using the mp2sas driver?   Tape drives aren’t
> typically SAS in my experience nor do they typically allow for multiple
> paths like disk drives do so there would be little reason to put them on a
> RAID style controller.
>
>
>
> Here we use the PERC (LSI OEM) on Dell but if we’re doing disk array or
> tapes we’re presenting them via Qlogic fibre HBAs.
>
>
>
> I’m curious what software you have that lets you manage the LSI RAID from
> the OS level.
>
>
>
> *From:* ale-bounces at ale.org [mailto:ale-bounces at ale.org] *On Behalf Of *Jim
> Kinney
> *Sent:* Friday, May 16, 2014 2:22 PM
> *To:* Atlanta Linux Enthusiasts
> *Subject:* Re: [ale] one kernel module, multiple devices
>
>
>
> 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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