Hi All, I ran mkfs on more than 1 scsi disk partitions in parallel in background on ia64 Lion machine with linux kernel 2.4.0. And after a few seconds, the system became damn slow. I can swith between the virtual terminals. But I cannot login from other virtual terminals. Also, I cannot do anything on the terminal on which I started the mkfs processes. If I run the mkfs sequentially, and then mount those partitions, then I can run the I/Os to file systems in parallel without any problem. Well, definitely, in this case, the I/Os are going through the file system layer of the kernel whereas in the former case, the I/Os to create the file system are not going through the file system layer of the kernel (except through the file system layer which handles devices). Also, running mkfs in parallel works perfectly without any problem on ia32 system with RedHat Linux 7.0 (kernel 2.2.16-22). Is there any thing broken in 2.4.0 file system layer which makes system damn slow ? If you need any more information, please let me know. Thanks and regards, -hiren - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] Please read the FAQ at http://www.tux.org/lkml/