Hi Cesar.Since 12.10.FC11, in fact:https://www.ibm.com/docs/en/informix-servers/12.10?topic=overview-whats-new-in-informix#newxc11_tocHowever, there are some problems. Have just retested with 14.10.FC6, and:1) The empty cooked device files have to exist.2) DIRECT_IO isn't enabled on those chunks unless you bounce IDS again.Our article (see link in previous post) advises that temp dbspace chunks are reinstated in RAM disk from a "tar" archive after reboot before IDS is started.
Found my notes for a slow temp space VM instance.
Looking at the AIO VP I saw it 'blocked' at the kernel with a the process showing State D (disk sleep). An AIO VP should never block forever in some disk sleep state.
The issue was an overloaded VM
Also, add this to /etc/sysctl.conf:
# Controls the maximum number of aio threadsfs.aio-max-nr = 1048576
05:17:48 Dynamically added 1 cpu VP
05:17:49 ** AUTO TUNING - Added CPU VP.
05:17:51 requested number of KAIO events (5461) exceeds limit (1024). using 1024.
05:17:51 VP 13 is requesting 1024 kaio event resources.
06:00:49 Performance Advisory: Unable to extend bufferpool 2K.
06:00:49 Results: Bufferpool has reached the # of extends '8' allowed.
06:00:49 Action: Increase the amount of memory the bufferpool can utilize.