Wednesday, September 30, 2015

SAN attached windows 2008 hangs on boot


Just for reference purpose:

Recently I was testing some disaster recovery scenario of restoring Server A to Server B with identical hardware using Symantec Backup EXEC 2014 Simplified Disaster Recovery [SDR]CD. The hardware specs were as follows …
IBM Xseries 3650 M4, with RAID1
Dual Q.Logic Fiber Channel cards Mode: QLE2560 connected with two FC switches for multi path and failover
32 GB RAM,
IBM v3700 storewize SAN Storage
The restore went fine , system boot fine for the first time with everything intact, but when I rebooted it again , it failed to boot and shows only cursor blinking,  As showed in the image below …
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I tried to boot it several times but with no results. I then removed the FC cables from the server’s Qlogic FC cards, and this time windows booted fine.

Solution:

I started the server without FC cables attached, then I removed the Windows MPIO features from ADD REMOVE FEATURES, and rebooted again with FC cables attached, and this time it works fine but showed duplicate SAN partitions. Then I applied IBM’s SSDM MPIO driver (MPIO_Win2008_x64_SDDDSM_64_2434-4_130816 for v3700 storewize)  and everything went fine :)
You may also want to read the IBM’s article.
http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=migr-5081613

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