Thanks for the response. I'm still a little lost. You're right on the relationship between major/minor and device names such as sda, sda1, sdb, etc.
The system that we've been working on is connected to an EMC SAN. It uses Redhat AS 2.1 (2.4 kernel). The problem that I'm trying to solve is where SAR -d lists only the following device names... dev8-0 dev8-1 dev8-2 dev8-3 dev8-4 It is these odd device names presented by SAR that have been the challenge. It appears that SAR maintains the major number but the minor is actually a distinct number (what the MAN means by 'distinct' is rather subjective). So I see SAR reporting that I have four physical devices. But when I look at IOSTAT -X I get the following devices... sda sda1 sda2 sda3 sda5 sda6 sda7 sda8 sdb sdb1 sdb2 sdc sdc1 sdd sdd1 sde sde1 When I run IOSTAT I get the following... dev8-0 dev8-1 dev8-2 dev8-3 dev8-4 My guess is that one of the following conditions is true (I'm not sure which one)... Solution 1... The major/minor numbers are correct but SAR has a bug in it which prevents it from displaying more than four devices (partitions). If this is true then I can map the devices out as follows... dev8-0 is the same as /dev/sda dev8-1 is the same as /dev/sda1 dev8-2 is the same as /dev/sda2 dev8-3 is the same as /dev/sda3 dev8-4 is the same as /dev/sda4 Solution 2... The major numbers are correct ( these are SCSI devices) but the "minor" number refers to the physical disk number. If this is true then the following might be true. I say 'might' because I don't know how to prove this. dev8-0 is the same as /dev/sda dev8-1 is the same as /dev/sdb dev8-2 is the same as /dev/sdc dev8-3 is the same as /dev/sdd dev8-3 is the same as /dev/sde Solution 3... Something else? Thanks for your help! ...Robert --- Gordon Messmer <[EMAIL PROTECTED]> wrote: > On Wed, 2003-02-19 at 14:21, Robert Vaughn wrote: > > The distinctive number does not translate 1 to 1 > with > > the minor number. If this were the case then when > I > > did the following I would get a different > answer... > > > > ls -l /dev/sdb ....produces 8,16 > > > > Using your theory I would expect 8,1 which would > allow > > the device to be translated to dev8-1. However, > the > > results are 8,16. > > That's not now Linux numbers devices. sda is > dev8,0. sda1 is dev8,1. > A SCSI disk has a max of 15 partitions, so the block > device itself (sda) > is minor 0, and each of its partitions increments > the minor number. At > the end of that sequence, the next disk begins. > Therefore, sdb is > dev8,16. sdb1 is dev8,17. > > > My understanding of partitions is that sda, sdb, > etc, > > refer to physical devices while sda1, sda2, sda3, > > sdb2, etc refer to partitions. > > Yep. > > > > > -- > redhat-list mailing list > unsubscribe > mailto:[EMAIL PROTECTED]?subject=unsubscribe > https://listman.redhat.com/mailman/listinfo/redhat-list __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/ -- redhat-list mailing list unsubscribe mailto:[EMAIL PROTECTED]?subject=unsubscribe https://listman.redhat.com/mailman/listinfo/redhat-list
