[nylug-talk] scsi, tape drive, kernel 2.6
Kiryl Hakhovich
administrator at bsolution.net
Mon Jul 16 17:16:45 EDT 2007
Luis Murillo wrote:
> hmm, I saw this issue once, I remembered that we resolved it by
> upgrading the kernel, but I don't know if that will be the case for
> you, you might want to try that though.
> I don't know how Dell troubleshoots their drives, but HP has a tool
> called Library and Tape Tools which we use to test the tape drives, in
> your case what I would do is run that utility and see if it detects
> the drive, you can get it at hp.com/support/tapetools
>
> Even if there is no device file created for the device the LTT tool
> could still detect the drive, if it does then I would assume that you
> have an issue with the software side and nothing with the hardware,
> although this conclusion might have already been considered by you ;)
>
> Peter, the drives could work on the RAID controllers, but this not
> always the case, it's recommended that you use a non-raid scsi HBA to
> connect tape drives to a server, again I don't know what Dell's policy
> is on this, but I know that this is what it's recommended. But what
> you mention would actually make sense in a way. :)
>
> -LM
>
> On 7/16/07, Kiryl Hakhovich <administrator at bsolution.net> wrote:
>
>> Luis Murillo wrote:
>>
>>> Just a quick question, to which SCSI controller do you have this drive
>>> connected to?
>>>
>>>
>> hmmm on the back of the server there is a scsci connector :)
>>
>>> Well, while I'm here, I might as well ask for a bit more information here ;)
>>>
>>> What technology is the tape drive?
>>>
>>>
>> It's a DLT PowerVault 124T tape library.
>>
>>> As far as I know, the tape drives are not supported on RAID
>>> controllers, they are only supported on standard SCSI HBAs.
>>>
>>>
>>>
>> This is may be true :) but then again, the controller before boot, says
>> that DLT tape drive detected on channel 1 with scsi-id 6.
>>
>>> I read over the multiple e-mails so I might have missed something,
>>> correct me if I'm wrong :)
>>>
>>> -LM
>>>
>>> On 7/16/07, Kiryl Hakhovich <administrator at bsolution.net> wrote:
>>>
>>>
>>>> Peter C. Norton wrote:
>>>>
>>>>
>>>>> On Mon, Jul 16, 2007 at 11:30:31AM -0400, Kiryl Hakhovich wrote:
>>>>>
>>>>>
>>>>>
>>>>>> Peter C. Norton wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>> On Mon, Jul 16, 2007 at 10:49:24AM -0400, Kiryl Hakhovich wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>> thanks for response, the trick is that it has 3 hard drives connected
>>>>>>>> to a different channel of same scsci controller, and fedora able to boot
>>>>>>>> from it and sees the raid just fine. Unless there is no support for
>>>>>>>> removable media in this driver?
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>> IIRC tape drives are supported as scsi "generic" devices. These
>>>>>>> devices are supported by the sg* device. So as a first step, make sure
>>>>>>> that you have the scsi generic driver loaded (sg).
>>>>>>>
>>>>>>> -Peter
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>> thanks Peter, here is a quick addition
>>>>>> [root at sys ~]# lsmod |grep sg
>>>>>> sg 37341 0
>>>>>> scsi_mod 138221 4 st,sg,aacraid,sd_mod
>>>>>> [root at sys ~]#
>>>>>>
>>>>>> so the driver is loaded, but does not seem to be used by anything :)
>>>>>>
>>>>>>
>>>>>>
>>>>> You also have the st driver, for scsi tapes, which means that I may be
>>>>> remembering incorrectly (ah... sg for cd-writers and for some
>>>>> functions of tapes that aren't covered by the st driver:
>>>>> http://sg.torque.net/sg/). You shouldn't immediately worry about the 0
>>>>> refcount, that just means that any associated devices aren't in use by
>>>>> this driver. Look at the st driver now.
>>>>>
>>>>> -Peter
>>>>>
>>>>>
>>>>>
>>>>>
>>>> yes i have read on friday a little about st driver, and it is loaded too
>>>> [root at sys ~]# lsmod |grep st
>>>> st 40157 0
>>>> scsi_mod 138221 4 st,sg,aacraid,sd_mod
>>>> [root at sys ~]#
>>>>
>>>>
>>>>
>>>> --
>>>> Sincerely,
>>>>
>>>> Kiryl Hakhovich
>>>>
>>>>
>>>> _____________________________________________________________________________
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>>>>
>>>>
>>>
>>>
>> --
>> Sincerely,
>>
>> Kiryl Hakhovich
>>
>>
>> _____________________________________________________________________________
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>>
>
>
>
After all a note from dell:
The autoloader may not work with multiple SCSI LUNS when attached to a
RAID controller. The autoloader is not recommended for use with a RAID
controller. If this problem occurs, it is recommended that the
autoloader be attached to a separate SCSI bus controller on the server.
and throwing additional scsi adapter into the server solves the problem.
Although question still there: why or why i have to do so, i'm getting
second channel of build in scsi unusable :)
--
Sincerely,
Kiryl Hakhovich
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