Content mirrored at https://blogs.oracle.com/storageops/entry/zfs_trick_scheduled_scrubs
A frequently-asked-question on ZFS Appliance-related mailing lists is "How often should I scrub my disk pools?" The answer to this is often quite challenging, because it really depends on you and your data.
Usually when asked a question I want to provide the answers to the questions they should have asked first, so that I'm certain our shared conversational contexts match up. So here's some background questions that we should have answers to before answering the "How often" question.
Imagine you're a system administrator, and an email arrives from your boss. It goes something like this:
"Hey, bud, we need some new storage for Project Qux. We heard that this [insert major company here] uses a product called the Oracle Sun ZFS Storage Appliance as the back-end for their [insert really popular app here]. We want to do something like that at similar scale; can you evaluate how well that compares to XYZ storage we already own?"
So you get in touch with your friendly local ZFS sales dudette, who arranges a meeting that includes a Sales Engineer to talk about technical stuff related to your application. The appliance, however, has an absolutely dizzying array of options. Where do you start?
I really, really like the place that I work. The commute is amazing. The facility is breathtaking. My co-workers are stunningly enthusiastic, skilled, and intelligent. My pay is... well, good enough to get by :-) Recently a thread popped up at Slashdot in which a lot of commenters trashed Oracle, and I felt a need to set some of the record straight.
I've recently been chiming in on the Garmin forums about my 910xt watch and Garmin VivoSmart. The frustration of users not knowing how to use their fitness trackers -- and blaming the devices for not being the magical weight loss talismans they thought they were! -- is palpable.
I've created a new blog with my work at https://blogs.oracle.com/storageops . The first entry is copied below.
I really liked Matt's play-by-play from his last triathlon, so I thought I'd add my own. I just completed my 2nd triathlon ever, an Olympic (aka International) distance event in Maine.
Garmin Connect logs:
Brief version race report for the Riverton Central Stake Sports triathlon today for those who asked. The race was free, and hosted by the local LDS churches in the area. I was number 409: fourth out of 5 waves, 9th registrant in that category.
Garmin Connect logs:
A philosopher named Harry G. Frankfurt wrote a brilliant essay a number of years ago entitled, "On BS". The title notwithstanding, the essay brilliantly examines a phenomenon you're going to see your whole life: people who say things for the effect of the saying, not the truth or falsehood of what it is they say.
Today I touch on a sensitive topic: body hair. If you are easily offended, please go read something else, as we're going to deal very bluntly with the topic.
I've been thinking for a long time that I need to write a series of very important things I've learned over my lifetime. Almost every day for the last year, some concept has occurred to me that would be good for my kids to know so they can avoid making the same mistakes I've made, or seen others close to me make.
In that vein, here's my first topic!
For My Children: The Nature of Multi-Level Marketing Companies