Re: mpt2sas logged messages

[Greg KH <greg@kroah.com>]

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
> >
> > Odd, what is the sysfs tree for this device?  You have expanders
> > attached to ports attached to expanders?  How deep can you go?
> >
> > thanks,
> >
> > greg k-h
> 
> There are two dual-port SAS HBA's in the server that plug into the first of the 
> 5 SAS expansion shelves. Each shelf has two internal SAS loops and is daisy 
> chained to the next shelf....  This test is running with just the first 4 
> shelves active (although that fifth shelf is plugged in, just not used/active).
> 
> Each of the 60 S-ATA disks sits behind a MUX card which lets it appear on both 
> loops.
> 
> We could break up the shelves into two independent sets of devices which would 
> limit the tree depth.
> 
> How can I get you the sysfs tree information in a useful way?

'tree /sys/devices/'
or
'find /sys/devices/'
would be good.

thanks,

greg k-h