Re: mpt2sas logged messages

[Ric Wheeler <rwheeler@redhat.com>]

On 08/18/2009 02:37 PM, Kay Sievers wrote:
> On Tue, Aug 18, 2009 at 18:40, Greg KH<greg@kroah.com>  wrote:
>> On Tue, Aug 18, 2009 at 11:53:32AM -0400, Ric Wheeler wrote:
>>> On 08/18/2009 10:57 AM, Greg KH wrote:
>>>> On Tue, Aug 18, 2009 at 09:59:56AM -0400, Ric Wheeler wrote:
>>>>
>>>>> On 08/18/2009 09:25 AM, Greg KH wrote:
>>>>>
>>>>>> On Tue, Aug 18, 2009 at 09:18:30AM -0400, Ric Wheeler wrote:
>>>>>>
>>>>>>> We have a new toy to test very large&     slow storage with built up from 5
>>>>>>> SAS expansion shelves (Promise Vtrak J-Class) with 60 S-ATA drives and
>>>>>>> 16 SAS drives (the S-ATA drives each have a Promise Vtrak S-ATA MUX
>>>>>>> adapter daughter card in the disk sled).
>>>>>>>
>>>>>>> The basic idea is to build a cheap&     slow test bed for file&     storage
>>>>>>> system scalability. Collectively, we have about 120TB (raw) of capacity
>>>>>>> to play with in one server.
>>>>>>>
>>>>>>> As we work through various issues, a couple of oddities popped out.
>>>>>>>
>>>>>>> The first is that udev grumbles during boot about "file name too long"
>>>>>>> like the following:
>>>>>>>
>>>>>>> Aug 17 06:49:58 megadeth udevd-event[20447]: unable to create db file
>>>>>>> '/dev/.udev/db/\x2fdevices\x2fpci0000:00\x2f0000:00:04.0\x2f0000:17:00.0\x2f0000:18:0a.0\x2f0000:1f:00.0\x2fhost11\x2fport-11:0\x2fexpander-11:0\x2fport-11:0:0\x2fexpander-11:1\x2fport-11:1:0\x2fexpander-11:2\x2fport-11:2:17\x2fexpander-11:3\x2fport-11:3:1\x2fend_device-11:3:1\x2fbsg\x2fend_device-11:3:1':
>>>>>>> File name too long
>>
>> Ok, it looks like the way that udev handles it's internal "database"
>> can't handle paths that are larger than a single filename size.
>>
>> Kay, I think this is all yours :)
>
> Yeah, seems so. Linux can not have filenames longer than 256. We'll
> need to change the way we store the DEVPATH in a filename. I'll look
> into it.
>
> Thanks,
> Kay

Hi Kay,

I think that we can reconfigure the storage to avoid this but will be happy to 
restore this configuration if you have something that you want to test later on...

Thanks!

Ric