[OpenAFS] hard drive reliability
John N. Riley III
Mon, 23 May 2016 13:34:33 -0600
Hard drive quality control has been the subject of a number of industry
analysts in the last few years as production levels drop and margins
continue to feel pressure. Western Digital and Seagate control over 80%
of the global market for platter-based HDD's. Toshiba is reported to be
exploring options to divest or sell HDD production. TechSpot recently
reported a class action lawsuit against Seagate over "extremely high
hard drive failure rates." HDD is a declining commodity and consumers
need to take steps to protect their intellectual property.
As previously noted, drives to tend to fail in batches and more
frequently at the beginning and end of their useful life. That said, we
do see a difference in enterprise class drive quality. We also note
that QC issues seem to be transient among manufacturers with aberrations
that will arise and then be corrected in all major brands. We monitor
these issues and change manufacturers as necessary in our appliances.
We strongly urge the community to take appropriate steps to backup your
data and employ methods that accurately determine new and changed data
to avoid copying over valid data with recently developed corrupted volumes.
On a related note, contaminants are also found in new magnetic tape.
This industry also has a very limited number of media manufacturers. In
this instance, however, at least one vendor, Spectra Logic Corporation,
will un-package and "carbide" clean the media prior to shipment. This
can reduce damage to tape drive heads resulting from particulate
accumulation and abrasion associated with the foreign material. I will
have to check to determine if they do this for TS11xx and T10K media in
addition to the LTO cartridges. They now support all three media
Teradactyl takes many precautions to protect a cell. If you plan to
simply copy data, please employ a strategy that provides protection
against silent corruption that can be inadvertently placed into your
"backup" environment. Recognize that RAID protection is a good first
step in your primary storage environment but is not a substitute for
backup. Finally, consider using multiple media types and employing a
media verification system to alert you to potential failure modes before
your situation becomes critical. The old adage of trust but verify
definitely holds true with hardware.
John Riley III
Teradactyl LLC. - Global Storage Solutions