We use 64-bit RHEL 5.8, kernel 2.6.18-308.11.1.el5. We want to put Oracle installation files on a shared NFS server. But runInstaller always fails with "Error in writing to directory /tmp/OraInstall..." message, even though /tmp has space and the said subdirectory can be written to. We *can* run OUI successfully if we copy the installation files to a local filesystem. The message is catch-all (according to one Oracle note). So we suspect some mount options are not up to Oracle's standard. We tried different ones, mainly "rw,bg,nointr,hard,timeo=600,wsize=32768,rsize=32768,nfsvers=3,tcp" and that plus "noac" (based on Note:553283.1). The error does not change. An strace is done as follows: ----------- BEGIN ----------- $ strace -o /tmp/abcd -f ./runInstaller -ignoreSysPrereqs ******************************************************************************** Please run the script rootpre.sh as root on all machines/nodes. The script can be found at the toplevel of the CD or stage-area. Once you have run the script, please type Y to proceed Answer 'y' if root has run 'rootpre.sh' so you can proceed with Oracle Clusterware installation. Answer 'n' to abort installation and then ask root to run 'rootpre.sh'. ******************************************************************************** Has 'rootpre.sh' been run by root? [y/n] (n) y [ Process PID=5544 runs in 32 bit mode. ] Starting Oracle Universal Installer... Checking installer requirements... Checking operating system version: must be redhat-3, SuSE-9, redhat-4, UnitedLinux-1.0, asianux-1 or asianux-2 Failed <<<< >>> Ignoring required pre-requisite failures. Continuing... Preparing to launch Oracle Universal Installer from /tmp/OraInstall2012-08-09_04-44-18PM. Please wait ...[ Process PID=5545 runs in 64 bit mode. ] [ Process PID=5545 runs in 32 bit mode. ] Error in writing to directory /tmp/OraInstall2012-08-09_04-44-18PM. Please ensure that this directory is writable and has atleast 60 MB of disk space. Installation cannot continue. : Invalid argument ----------- END ----------- The strace output near the error has these lines: 25078 dup(2) = 5 25078 fcntl64(5, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE) 25078 fstat64(5, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 0), ...}) = 0 25078 mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xfffffffff7f70000 25078 _llseek(5, 0, 0xff8f0ac0, SEEK_CUR) = -1 ESPIPE (Illegal seek) ... 25078 write(5, "\n", 1) = 1 25078 write(5, "Error in writing to directory /t"..., 181) = 181 25078 write(5, ": Invalid argument\n", 19) = 19 Apparently, stderr (file descriptor 2), duplicated to descriptor 5, goes through a seek. It's not even seekable as far as I know. Any input is appreciated. It's not a big issue. Just something nice to have. Yong Huang -- //www.freelists.org/webpage/oracle-l