Hi All, I am writing a pseudo driver for which a want to add support for sun cluster. I am really puzzle to see the way devices are getting accessed on the secondary node (node where resource group is offline).
I have setup a two node fail-over sun cluster and did some experiments to understand the device status on different cluster nodes. one of them which seems bizarre to me are as follows:- 1. I have mounted file-system on clustered device on the primary without global option. Now what is my understanding is on other node this device should not be accessible in the read/write mode (or at least in write mode) since the device is mounted on the primary. But I could mount (without global option) the same device even on secondary node and not only that I create some files as well. Even I could wrote to the device using dd(1m) no wonder it corrupted the file-system. Now, my question is why shared devices is not protected from secondary while is mounted on primary node? if this is expected behavior that means sun cluster entirely relies on application of behave well and if someone by mistake do a dd(1m) on the device from the secondary then everything is gone for the good, is that acceptable behavior? May be there could be configuration issue in my cluster that why I was allowed to access the device from the secondary. I am using HA storage plus and default fencing is pathcount and the file-system type was ufs. Any idea or suggestion would be a great rescue. thanks, ajit jain PS: please add in cc list, I am a member of the mailing list.
