I am currently working through an issue with my 3-node RAC clusters (RHEL 5.6 x86_64 and Oracle RAC 11g running on HP DL580-G7 servers). They seem to enjoy rebooting themselves at will. There is nothing glaring for a root cause, other than some messages in the syslog about blocking for more than 120 seconds. Anyhow - after quite a bit of research I have discovered some things I really like about Linux. They have made the disk scheduler modular (in a sense). Therefore you can utilize your disk access in one of 4 methods. The CCISS is the HP Smart Array driver which is loaded and should be consistent in most Linux releases. If you initially look at the "scheduler" file - you can see your four options. The one in use is surrounded by brackets. I am hoping that by changing the access for ONLY the cciss device to noop, that my reboots go away - and I leave a positive legacy behind at my customer-site ;-) root@dbslp0067:/root # cd /sys/block/cciss\!c0d0/queue/
Linux: The whole world made it for you... This blog is a collection of things I come across either at home or at work as a Linux Administrator. I have worked as an Admin working with Solaris, SAN, Backups and Linux at the Enterprise level for over 16 years.