Thank you for all of the good pointers, everyone. croinfo and diskinfo don't give me any output, but that's not surprising since this is a home-built system. But it's good to know those utilities exist for production hardware.
Making the association between the disk serial number and target number by matching them up in the iostat -En or prtconf output looks like it will work for me. Thanks again! -Matthew On Wed, Dec 21, 2011 at 8:21 AM, Garrett D'Amore <garrett.dam...@nexenta.com > wrote: > > On Dec 21, 2011, at 3:14 AM, James C. McPherson wrote: > > > On 21/12/11 05:58 PM, Matthew R. Wilson wrote: > >> Hello, > >> > >> I am curious to know if there is an easy way to guess or identify the > >> device names of disks. Previously the /dev/dsk/c0t0d0s0 system made > sense > >> to me... I had a SATA controller card with 8 ports, and they showed up > >> with the numbers 1-8 in the "t" position of the device name. > >> > >> But I just built a new system with two LSI SAS HBAs in it, and my device > >> names are along the lines of: > >> /dev/dsk/c0t5000CCA228C0E488d0 > >> > >> I could not find any correlation between that identifier and the a) > >> controller the disk was plugged in to, or b) the port number on the > >> controller. The only way I could make a mapping of device name to > >> controller port was to add one drive at a time, reboot the system, and > run > >> "format" to see which new disk name shows up. > >> > >> I'm guessing there's a better way, but I can't find any obvious answer > as > >> to how to determine which port on my LSI controller card will correspond > >> with which seemingly random device name. Can anyone offer any > suggestions > >> on a way to predict the device naming, or at least get the system to > list > >> the disks after I insert one without rebooting? > > > > Hi Matthew, > > By default the names for disks attached via mpt_sas(7d), or > > mpt(7d) if your disks are new enough, is to use their WWN > > as reported in the SCSI INQUIRY Page83 response. > > > > The old paradigm you refer to is based on the physical id > > of the device on a parallel SCSI bus. That doesn't scale > > with SAS, and is something we're trying to move away from. > > More to the point, on SAS and other similar busses, there simply *isn't* > such a thing as a simple target number. The old numbering scheme from > parallel SCSI was suitable when you could have only 7 or 15 or so devices > on a single bus. With modern busses you can have many thousands of devices > on the same fabric. So we address them by WWN. > > - Garrett > > > > If you'd like some info about how we use devids and guids, > > please refer to my presentation > > > > http://www.jmcp.homeunix.com/~jmcp/WhatIsAGuid.pdf > > > > > > For your particular configuration, if you note the serial > > number and WWN of the device before you insert them, you > > can match that up with info from iostat -En and/or prtconf -v. > > > > > > hth, > > James C. McPherson > > -- > > Oracle > > http://www.jmcp.homeunix.com/blog > > _______________________________________________ > > zfs-discuss mailing list > > firstname.lastname@example.org > > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss > >
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