Date: Fri, 05 Oct 2007 06:55:07 -0500 From: Eric Anderson <anderson@freebsd.org> To: Sharad Chandra <sharadc@in.niksun.com> Cc: freebsd-hackers@freebsd.org Subject: Re: SCSI and SAN Message-ID: <4706261B.1050202@freebsd.org> In-Reply-To: <200710051646.17618.sharadc@in.niksun.com> References: <200710041725.00842.sharadc@in.niksun.com> <4704E8F1.8070000@freebsd.org> <200710051646.17618.sharadc@in.niksun.com>
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Sharad Chandra wrote: > On Thursday 04 October 2007 6:51 pm, Eric Anderson wrote: >> Sharad Chandra wrote: >>> Hello, >>> >>> How to distinguish if /dev/da* devices are internal scsi drivers or LUNs >>> of external SAN? >> camcontrol devlist -v >> >> Might help you.. >> >> Eric > Yes, right by analyzing camcontrol devlist it can be told, but i guess not > always. > > [root@qa7 ~]# camcontrol devlist > <IFT A16F-G2422 348C> at scbus0 target 0 lun 0 (da0,pass0) > <IFT A16F-G2422 348C> at scbus0 target 0 lun 1 (da1,pass1) > <IFT A16F-G2422 348C> at scbus0 target 0 lun 2 (da2,pass2) > <IFT A16F-G2422 348C> at scbus0 target 0 lun 3 (da3,pass3) > > Here luns are increasing, so it is SAN confirmed by tool. Now my point is if i > have a SAN of less than 1TB and i make only 1 LUN. what should be output? > guessing: similar to > <IFT A16F-G2422 348C> at scbus0 target 0 lun 0 (da0,pass0) > > Then it will be difficult to tell, whether it is regular SCSI drives or SAN. > Then we need a tool that can tell this da0 belongs to SAN/SCSI or not Notice the -v to camcontrol. It will tell you which controller the device belongs to, and the controller will help you determine whether it is connected to a SAN or not. Other than that, I'm not sure of the distinction that could be made between the devices whether it is on a SAN or not. It could be a directly connected fiber channel device, in which case, it isn't quite a SAN, yet the FreeBSD system doesn't know (or care) how it's connected. Eric
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