How to force a reset of a device (disk) in an enclosre slot

[Kenneth D. Merry]

On Sat, Sep 15, 2012 at 02:24:37 +0000, John wrote:
> Hi Folks,
> 
>    I've been poking around and can't seem to find a way to reset and
> hopefully acquire access to a disk device in an enclosure. For instance:
> 
> FreeBSD 9.1-PRERELEASE
> 
> # camcontrol smpphylist ses4
> 37 PHYs:
> PHY  Attached SAS Address
>   0  0x5000039368233602   <HP EG0600FBDSR HPD4>             (pass105,da98)
>   1  0x5000039368238e3e   <HP EG0600FBDSR HPD4>             (pass106,da99)
>   2  0x500003936823bca2   <HP EG0600FBDSR HPD4>             (pass107,da100)
>   3  0x500003936819507e   <HP EG0600FBDSR HPD4>             (pass108,da101)
>   4  0x5000039368197d5a   <HP EG0600FBDSR HPD4>             (pass109,da102)
>   5  0x5000039368197c6e   <HP EG0600FBDSR HPD4>             (pass110,da103)
>   6  0x500003936818770e   <HP EG0600FBDSR HPD2>             (pass111,da104)
>   7  0x5000039368238eba   <HP EG0600FBDSR HPD4>             (pass112,da105)
>   8  0x5000039368232f42   <HP EG0600FBDSR HPD4>             (pass113,da106)
>   9  0x0000000000000000
>  10  0x500003936813c31e
>  11  0x5000039368233892   <HP EG0600FBDSR HPD4>             (pass114,da107)
>  12  0x500003936813c2ca   <HP EG0600FBDSR HPD4>             (pass115,da108)
> ...
> 
> Note, bay/slot 10 has a listed device address. If I were to pull the
> drive and re-insert it, it would show up (as da390 in this case).
> The above is after a fresh reboot. Note da106 to da107 skipping
> slot 10 (slot 9 is empty).
> 
> The smp utils provide a similar view:
> 
> # smp_discover /dev/ses4 
>   phy   0:D:attached:[5000039368233602:00  t(SSP)]  6 Gbps
>   phy   1:D:attached:[5000039368238e3e:00  t(SSP)]  6 Gbps
>   phy   2:D:attached:[500003936823bca2:00  t(SSP)]  6 Gbps
>   phy   3:D:attached:[500003936819507e:00  t(SSP)]  6 Gbps
>   phy   4:D:attached:[5000039368197d5a:00  t(SSP)]  6 Gbps
>   phy   5:D:attached:[5000039368197c6e:00  t(SSP)]  6 Gbps
>   phy   6:D:attached:[500003936818770e:00  t(SSP)]  6 Gbps
>   phy   7:D:attached:[5000039368238eba:00  t(SSP)]  6 Gbps
>   phy   8:D:attached:[5000039368232f42:00  t(SSP)]  6 Gbps
>   phy  10:D:attached:[500003936813c31e:00  t(SSP)]  6 Gbps
>   phy  11:D:attached:[5000039368233892:00  t(SSP)]  6 Gbps
>   phy  12:D:attached:[500003936813c2ca:00  t(SSP)]  6 Gbps
> ...
> 
> The address of slot 10 matches. There is a disk in the slot - just
> isn't recognized and attached.
> 
> Back to the basic question. How can I issue a command to the enclosure
> to force a re-initialization of the device to recover it without
> having to physically pull & insert it. Even if the device numbers
> are not sequential, I need access to the drive...

You can try sending a link reset:

camcontrol smppc ses4 -p 10 -o linkreset

It may or may not work.  You can also try disabling the PHY (-o disable)
and then sending a link reset to re-enable the link.  You can also try a
hard reset (-o hardreset)

Ken
-- 
Kenneth Merry
ken at FreeBSD.ORG