Re: MPTSAS: ("activate status led" | "find disc") in external enclosure

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Tue, 2008-04-22 at 09:18 +0200, Lars Täuber wrote:
> James Bottomley <James.Bottomley@HansenPartnership.com> schrieb:
> > On Mon, 2008-04-21 at 11:01 +0200, Lars Täuber wrote:
> > > # ls /sys/class/enclosure/*/
> > > /sys/class/enclosure/6:0:16:0/:
> > > 0  10  12  14  2  4  6  8  components  subsystem
> > > 1  11  13  15  3  5  7  9  device      uevent
> > > 
> > > /sys/class/enclosure/6:0:33:0/:
> > > 0  10  12  14  2  4  6  8  components  subsystem
> > > 1  11  13  15  3  5  7  9  device      uevent
> > > 
> > > This is two times the same enclosure.
> > 
> > That's unusual .. to have two devices managing the same enclosure, but
> > if you only have 16 slots and not 32, I suppose it must be so.
> 
> I use both external connections to both expanderboards of the enclosure just for redundancy.
> 
> 
> > > monosan:/sys/class/enclosure/6:0:16:0/0 # ls -l
> > > insgesamt 0
> > > -rw-r--r-- 1 root root 4096 21. Apr 10:48 active
> > > -rw-r--r-- 1 root root 4096 21. Apr 10:48 fault
> > > -rw-r--r-- 1 root root 4096 21. Apr 10:48 locate
> > > -rw-r--r-- 1 root root 4096 21. Apr 10:48 status
> > > lrwxrwxrwx 1 root root    0 21. Apr 10:46 subsystem -> ../../../enclosure_component
> > > -r--r--r-- 1 root root 4096 21. Apr 10:48 type
> > > --w------- 1 root root 4096 21. Apr 10:48 uevent
> > > 
> > > There seems to be no device link if I understood you correctly.
> > > Is the subdirctory numbering somehow in relation to the SCSI ID?
> > 
> > If the slot is populated a device link should appear (this
> > is the tricky bit because the ses driver uses VPD inquiries to match up
> > the reported disk, assuming the enclosure reports it, to the actual one.
> > These work for SAS disks, but not for SATA ones).
> 
> So this will never work for the SATA discs in our enclosure, right? Or is there a chance with asking LSI to do something in their firmware?

I don't think its an LSI issue.  The enclosure itself collects WWNs from
the inserted drives.  SAS drives have an agreed format which they
present in a VPD INQUIRY, so they're easy to match up.  SATA drives have
a defined way of manufacturing this information (defined in the SAT
standard).  I just need to plug one of these in and make sure my
enclosure does this correctly.  Once that's done, I have to persuade the
ATA people to add the correct form of translation for the VPD inquiry to
libata's SAT layer ... then it should all "just work".  So it's
basically just some development work.

> Seems I have no chance to get to know which slot contains the failed drive without a shutdown. Bad luck.

You could start by asking the sg_ses tools what you have.  You need to
find the sg device for your enclosure and then do

sg_ses --page=10 /dev/sg<n>

It will print out a list of what the enclosure thinks the addresses for
the devices are.  Then I just need to verify they're SAT format and away
we can go.

James


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