I upgraded my storage server this morning from 5.5 to 5.6 and have quite a few issues with servers attaching to the iSCSI target... 1) Prior to the upgrade, I had our initiators configured with a username and password with CHAP and after the reboot I began having issues mounting their LUN. Looking through the logs I see: CHAP initiator auth.: authentication of iqn.2011-03.com.millbrookprinting.server:01:9386dd56f7d failed (wrong secret!?) Taking out the username and password and reattaching to the target works fine. 2) One server is particular has a 2TB LUN assigned to it and cannot mount it; which worked previously. May 6 10:55:29 server kernel: sdc : very big device. try to use READ CAPACITY(16). May 6 10:55:29 server kernel: sdc : unsupported sector size 1229280288. May 6 10:55:29 server kernel: SCSI device sdc: 0 512-byte hdwr sectors (0 MB) I see in some of the forums that downgrading the software "should" fix the issue? Packages are: libibverbs-1.1.3-2.el5 openib-1.4.1-5.el5 librdmacm-1.0.10-1.el5 scsi-target-utils-1.0.8-0.el5_6.1 Kernel: 2.6.18-238.9.1.el5 64bit CentOS 5.6 Thanks, Jason