Thumper features in EON ZFS storage

With binary kit 122, the package SUNWhd (tools and driver download) used in thumper was added to EON. With this package you get the capability to tell a great deal of metrics about your disks. It gives the ability to control read and write cache. It allows to tell firmware revision, vendor, serial and very importantly, the temperature of the disks.

We know that higher temperature disks, perform less efficiently. In my DIY ZFS storage case, hdadm showed that there was insufficient cooling or air was not being moved efficiently through the cage as the temperature of the 15K rpm drives continuously inched towards the clip or shutdown temperature. The clip temperature can be seen in the output of:

smartctl -d scsi -a /dev/rdsk/cXtXdXsX
...   excerpt
Device supports SMART and is Enabled
Temperature Warning Enabled
SMART Health Status: OK

Current Drive Temperature:     48 C
Drive Trip Temperature:        65 C
Manufactured in week 31 of year 2006

Re-orientation of the drives and re-positioning a 20MM fan seems to be holding at 53 degree C. I'll focus on getting temperatures down to the 36-40 degree C range. For more use see hdadm which is a wrapper script for calling the hd binary.

hdadm display
                                                            
Device    Serial        Vendor   Model             Rev  Temperature
------    ------        ------   -----             ---- -----------
c0t1d0p0  DNL3P68018NM  FUJITSU  MAX3036NC         5D03 53 C (127 F)
c0t2d0p0  DNL3P6400SDR  FUJITSU  MAX3036NC         5D03 58 C (136 F)
c0t3d0p0  DNL3P68018NN  FUJITSU  MAX3036NC         5D03 54 C (129 F)
c1t1d0p0  DNL3P6400SEE  FUJITSU  MAX3036NC         5D03 49 C (120 F)
c1t2d0p0  DNL3P68018BC  FUJITSU  MAX3036NC         5D03 51 C (123 F)
c1t3d0p0  DNL3P68018NV  FUJITSU  MAX3036NC         5D03 46 C (114 F)
c2d0p0    HNCF128MMG=STCB21M84025C03356C1  MG      84025C03356C1     -    None

A hard drive performance test can be run using:

hdadm diskqual