immense delayed write to file system (ZFS and UFS2), performance issues

[Damian Gerow]

Adrian Wontroba wrote:
: How about using the "write every 5 seconds" python script posted earlier
: in this thread by erik at tefre.com? Works nicely for me and stops the load
: cycle count increase.

I have a WD2003FYPS sitting in a system, to be used for testing.  Bought it
just before this thread started, and here's what it looks like right now:

  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always -       508
  193 Load_Cycle_Count      0x0032   200   200   000    Old_age   Always -       2710

This drive is sitting, unused, with no filesystem, and I've performed
approximately zero writes to the disk.

Having a script kick off and write to a disk will help so long as that
disk is writable; if it's being used as a hot spare in a raidz array, it's
not going to help much.