CentOS 5.2 (x86_64), open-iscsi (iscsi-initiator-utils RPM) v6.2.0.868.
I'm trying to connect my system to two LUNs created for me on an
MD3000i, but am only able to successfully connect to one of the two.

Initiator is a Dell PowerEdge M600 blade.

Steps are pretty straightforward:

1. Start iscsid
2. Get a list of targets:

  # iscsiadm -m discovery -t sendtargets -p 192.168.130.101
  192.168.130.101:3260,1 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
  192.168.130.102:3260,2 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
  192.168.131.101:3260,1 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
  192.168.131.102:3260,2 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862
  [fe80:0000:0000:0000:021e:c9ff:fef3:37df]:3260,1 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862

  Currently only 192.168.130.101 is active and my initiator has a
  dedicated interface on the same network with IP 192.168.130.2/24

3. MD3000i admin adds my initiator id to the target LUN(s)
4. Log in to the target:

  # iscsiadm -m node -p 192.168.130.101 -T 
iqn.1984-05.com.dell:powervault.6001ec9000f337dd0000000048bdc862 --login

At this point I check dmesg to see what's happened.  Oddly enough,
*three* LUN's have attached, and one of them appears to not be working
correctly:

  SCSI device sdc: 197253922 512-byte hdwr sectors (100994 MB)
  sdc: Write Protect is off
  sdc: Mode Sense: 77 00 10 08
  SCSI device sdc: drive cache: write back w/ FUA
  SCSI device sdc: 197253922 512-byte hdwr sectors (100994 MB)
  sdc: Write Protect is off
  sdc: Mode Sense: 77 00 10 08
  SCSI device sdc: drive cache: write back w/ FUA
   sdc:end_request: I/O error, dev sdc, sector 0
  Buffer I/O error on device sdc, logical block 0
  Buffer I/O error on device sdc, logical block 1
  Buffer I/O error on device sdc, logical block 2
  Buffer I/O error on device sdc, logical block 3
  end_request: I/O error, dev sdc, sector 0
  Buffer I/O error on device sdc, logical block 0
  Buffer I/O error on device sdc, logical block 1
  Buffer I/O error on device sdc, logical block 2
  Buffer I/O error on device sdc, logical block 3
  end_request: I/O error, dev sdc, sector 0
  Buffer I/O error on device sdc, logical block 0
  Buffer I/O error on device sdc, logical block 1
  end_request: I/O error, dev sdc, sector 0
  end_request: I/O error, dev sdc, sector 0
  end_request: I/O error, dev sdc, sector 0
  end_request: I/O error, dev sdc, sector 0
  Dev sdc: unable to read RDB block 0
  end_request: I/O error, dev sdc, sector 0
  end_request: I/O error, dev sdc, sector 0
   unable to read partition table
  sd 3:0:0:0: Attached scsi disk sdc
  sd 3:0:0:0: Attached scsi generic sg4 type 0
    Vendor: DELL      Model: MD3000i           Rev: 0670
    Type:   Direct-Access                      ANSI SCSI revision: 05
  SCSI device sdd: 734003200 512-byte hdwr sectors (375810 MB)
  sdd: Write Protect is off
  sdd: Mode Sense: 77 00 10 08
  SCSI device sdd: drive cache: write back w/ FUA
  SCSI device sdd: 734003200 512-byte hdwr sectors (375810 MB)
  sdd: Write Protect is off
  sdd: Mode Sense: 77 00 10 08
  SCSI device sdd: drive cache: write back w/ FUA
   sdd: unknown partition table
  sd 3:0:0:1: Attached scsi disk sdd
  sd 3:0:0:1: Attached scsi generic sg5 type 0
    Vendor: DELL      Model: Universal Xport   Rev: 0670
    Type:   Direct-Access                      ANSI SCSI revision: 05
  SCSI device sde: 40960 512-byte hdwr sectors (21 MB)
  sde: Write Protect is off
  sde: Mode Sense: 77 00 10 08
  SCSI device sde: drive cache: write through w/ FUA
  SCSI device sde: 40960 512-byte hdwr sectors (21 MB)
  sde: Write Protect is off
  sde: Mode Sense: 77 00 10 08
  SCSI device sde: drive cache: write through w/ FUA
   sde: unknown partition table
  sd 3:0:0:31: Attached scsi disk sde
  sd 3:0:0:31: Attached scsi generic sg6 type 0

Sure enough, I can work with /dev/sd[de] but not with /dev/sdc.  I've
tried this from another machine with the same results... can anyone
take a gander at what could generate the I/O errors as seen above?
Hopefully I'll be able to take a look at the MD3000i configuration and
see if anything stands out, but perhaps someone out there has worked
with this combination before and knows off the top of their head what's
fouling up here.

Thanks in advance!
Ray

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