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

[Boris Samorodov]

On Tue, 26 Jan 2010 20:45:10 +0200 Dan Naumov wrote:

> This discussion made me have a look at my 2tb WD Green disks...

So did I. Hm, it's a "nice" feature:
-----
Model Family:     Western Digital RE2-GP family
Device Model:     WDC WD1000FYPS-01ZKB0
Firmware Version: 02.01B01
User Capacity:    1 000 204 886 016 bytes
...
  9 Power_On_Hours          0x0032   082   082   000    Old_age   Always       -       13206
193 Load_Cycle_Count        0x0032   001   001   000    Old_age   Always       -       1883216
-----

Seems I'm a winner with my nearly 2M cycles. :-(

I use another script to stop that horror at five disks:
-----
#!/bin/sh

while true; do
  for i in `jot 5`; do
    sudo fdisk -p ada$i > /dev/null 2>&1
  done
  sleep 5
done
-----

-- 
WBR, Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD Committer, http://www.FreeBSD.org The Power To Serve