Date: Fri, 5 Oct 2007 18:28:08 +0530 From: Sharad Chandra <sharadc@in.niksun.com> To: Eric Anderson <anderson@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: SCSI and SAN Message-ID: <200710051828.08343.sharadc@in.niksun.com> In-Reply-To: <4706261B.1050202@freebsd.org> References: <200710041725.00842.sharadc@in.niksun.com> <200710051646.17618.sharadc@in.niksun.com> <4706261B.1050202@freebsd.org>
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On Friday 05 October 2007 5:25 pm, Eric Anderson wrote: > 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. [root@qa7 ~]# camcontrol devlist -v scbus0 on isp0 bus 0: <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) < > at scbus0 target -1 lun -1 () scbus-1 on xpt0 bus 0: < > at scbus-1 target -1 lun -1 (xpt0) Does it? > > 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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