Hello everybody,
Is there a limit on the number of devices that SCSI supports. In other words, I have a QLogic HBA card, and I am connecting to a SAN which has 64 targets.
I also have one local SCSI disk. So the total number of targets that I need to see is 65.
So now what happens is that all but ONE disc/target gets correctly mapped and a device file is created except for one. This happens to be /dev/sdbm which maps to /dev/sg64
Looks like the SCSI midlayer also sees the target but the only thing that does not seem to happen is that the device file /dev/sdbm is not getting created.
I am attaching below the output:
If you go all the way down, the last entry which is a valid disc gets mapped correctly but a /dev/sdbm device file does not get created.
Any thoughts as to why this is happening. Is there a limitation on SCSI ability to handle only 64 discs? I would really appreciate any help.
I am running 2.6.9-42.
I might be wrong, but I think i tried this same configuration on RHEL5 and I think it works. I will double check though. Was there a patch that was applied to fix this issue.
Thanks in advance.
Vinay
[root@localhost ~]# sg_map -x
/dev/sg0 0 0 0 0 0 /dev/sda
/dev/sg1 2 0 0 0 0 /dev/sdb
/dev/sg2 2 0 1 0 0 /dev/sdc
/dev/sg3 2 0 2 0 0 /dev/sdd
/dev/sg4 2 0 3 0 0 /dev/sde
/dev/sg5 2 0 4 0 0 /dev/sdf
/dev/sg6 2 0 5 0 0 /dev/sdg
/dev/sg7 2 0 6 0 0 /dev/sdh
/dev/sg8 2 0 7 0 0 /dev/sdi
/dev/sg9 2 0 8 0 0 /dev/sdj
/dev/sg10 2 0 9 0 0 /dev/sdk
/dev/sg11 2 0 10 0 0 /dev/sdl
/dev/sg12 2 0 11 0 0 /dev/sdm
/dev/sg13 2 0 12 0 0 /dev/sdn
/dev/sg14 2 0 13 0 0 /dev/sdo
/dev/sg15 2 0 14 0 0 /dev/sdp
/dev/sg16 2 0 15 0 0 /dev/sdq
/dev/sg17 2 0 16 0 0 /dev/sdr
/dev/sg18 2 0 17 0 0 /dev/sds
/dev/sg19 2 0 18 0 0 /dev/sdt
/dev/sg20 2 0 19 0 0 /dev/sdu
/dev/sg21 2 0 20 0 0 /dev/sdv
/dev/sg22 2 0 21 0 0 /dev/sdw
/dev/sg23 2 0 22 0 0 /dev/sdx
/dev/sg24 2 0 23 0 0 /dev/sdy
/dev/sg25 2 0 24 0 0 /dev/sdz
/dev/sg26 2 0 25 0 0 /dev/sdaa
/dev/sg27 2 0 26 0 0 /dev/sdab
/dev/sg28 2 0 27 0 0 /dev/sdac
/dev/sg29 2 0 28 0 0 /dev/sdad
/dev/sg30 2 0 29 0 0 /dev/sdae
/dev/sg31 2 0 30 0 0 /dev/sdaf
/dev/sg32 2 0 31 0 0 /dev/sdag
/dev/sg33 2 0 32 0 0 /dev/sdah
/dev/sg34 2 0 33 0 0 /dev/sdai
/dev/sg35 2 0 34 0 0 /dev/sdaj
/dev/sg36 2 0 35 0 0 /dev/sdak
/dev/sg37 2 0 36 0 0 /dev/sdal
/dev/sg38 2 0 37 0 0 /dev/sdam
/dev/sg39 2 0 38 0 0 /dev/sdan
/dev/sg40 2 0 39 0 0 /dev/sdao
/dev/sg41 2 0 40 0 0 /dev/sdap
/dev/sg42 2 0 41 0 0 /dev/sdaq
/dev/sg43 2 0 42 0 0 /dev/sdar
/dev/sg44 2 0 43 0 0 /dev/sdas
/dev/sg45 2 0 44 0 0 /dev/sdat
/dev/sg46 2 0 45 0 0 /dev/sdau
/dev/sg47 2 0 46 0 0 /dev/sdav
/dev/sg48 2 0 47 0 0 /dev/sdaw
/dev/sg49 2 0 48 0 0 /dev/sdax
/dev/sg50 2 0 49 0 0 /dev/sday
/dev/sg51 2 0 50 0 0 /dev/sdaz
/dev/sg52 2 0 51 0 0 /dev/sdba
/dev/sg53 2 0 52 0 0 /dev/sdbb
/dev/sg54 2 0 53 0 0 /dev/sdbc
/dev/sg55 2 0 54 0 0 /dev/sdbd
/dev/sg56 2 0 55 0 0 /dev/sdbe
/dev/sg57 2 0 56 0 0 /dev/sdbf
/dev/sg58 2 0 57 0 0 /dev/sdbg
/dev/sg59 2 0 58 0 0 /dev/sdbh
/dev/sg60 2 0 59 0 0 /dev/sdbi
/dev/sg61 2 0 60 0 0 /dev/sdbj
/dev/sg62 2 0 61 0 0 /dev/sdbk
/dev/sg63 2 0 62 0 0 /dev/sdbl
/dev/sg64 2 0 63 0 0
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