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Whither btrfsck?

Whither btrfsck?

Posted Oct 11, 2011 22:21 UTC (Tue) by SEJeff (subscriber, #51588)
In reply to: Whither btrfsck? by jcm
Parent article: Whither btrfsck?

LASIK was approved by the FDA in 1995. Do you run RHEL 2.1 (released Oct 1995) in production because you're letting other people beta test this new stuff like RHEL4?

Even though many people see Oracle's Unbreakable Linux as CentOS with a nice kernel, that doesn't mean Oracle isn't doing some absolutely bleeding edge Linux work. For them to commit to officially supporting btrfs in their OEL builds means that they'll commit to supporting it in real production environments. That does say an awful lot about it coming from the company who employs the lead developer of said filesystem.

Give it a year or two of solid beating and it will be good to go. My personal take is that if ext4 gets stable snapshotting support, it will be good enough for most people.

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Whither btrfsck?

Posted Oct 11, 2011 22:33 UTC (Tue) by dlang (subscriber, #313) [Link]

and how exactly did the FDA test what happens to people's eyes 40 years after the LASIK surgery? how do you really know that you aren't trading the inconvenience of wearing glasses for some years of blindness later?

being wary of LASIK for something irreplaceable like your eyes is not completely unreasonable.

Whither btrfsck?

Posted Oct 11, 2011 22:38 UTC (Tue) by corbet (editor, #1) [Link]

What?? You mean you didn't back up your eyes before letting the Lasik people hack on them?!? I bet you didn't wait for the repair tool to be ready either.

Actually, for some of us, being able to restore our eyes to a 40-year-old backup starts to sound pretty nice. That said, I'm not sure how apt the comparison really is...

Whither btrfsck?

Posted Oct 11, 2011 22:49 UTC (Tue) by SEJeff (subscriber, #51588) [Link]

Not being an opthomologist, I am the wrong person to ask. However, since Dr Caster (the guy who wrote *the* book[1] on LASIK and performed my procedure) had the surgery himself, chances are the effects are understood well enough. . LASIK is a physical procedure, not something like a medicine which may cause kidney damage 40 years down the road. It either works, or it doesn't.

However this is way off topic and I was only using that reference in jest. The parent commenter has good reasons for his opinion as some people are more risk adverse than others. This is LWN, not /., lets talk more about the tech.


Whither btrfsck?

Posted Oct 12, 2011 2:01 UTC (Wed) by jg (subscriber, #17537) [Link]

I sat next to an opthamologist who specialized in LASIK one trip; turns out the basic operation of using a microtome goes back a very long way, so they had very high confidence about the very long term consequences of opening up the eye since it had been done for many decades for other reasons, The only twist was adding the laser to precisely control the material removed.

Whither btrfsck?

Posted Oct 12, 2011 22:18 UTC (Wed) by rahvin (subscriber, #16953) [Link]

PRK and it's predecessors were in wide use in the early 80's and it was developed far earlier. What they did and what Lasik does are only different in the tool used to make the cuts. The stuff in the early 80's was done by hand with scalpels in a hospital, today it's done in an outpatient surgery through the lens with computer controlled lasers using layouts developed mostly by hand in the 80's. The most recent versions of Lasik now can map and create custom modifications of the standard cut patterns.

But basically the procedure's been in use for more than 30 years. Considering the procedure isn't even recommended until your 20's and myopia sets in at 40 the effects of Lasik on aging eyes are well understood at this point. If you are avoiding Lasik because you think it's long term effects aren't known you really need to look into it more and understand the history.

My wife went from about 20-400 with an astigmatism (before surgery got worse every year) to 20-15 and hasn't had a single problem (other than the night halos which are guaranteed). In her opinion it was the best 3 grand we ever spent. She can even see better than me and her vision is fixed by the scars, other than age related myopia her vision will never change.

OT: myopia vs. presbyopia

Posted Dec 6, 2011 4:54 UTC (Tue) by Duncan (guest, #6647) [Link]

Myopia (near-sightedness) setting in in one's forties? Umm... Not commonly.

More like presbyopia, age related loss of focus/accommodation ability for near work, reading and the like, typically noticed first in one's 40s reading small print in dim light, and generally thought to be related to loss of crystalline lens elasticity.

There's also hyperopia aka farsightedness. Presbyopia is often called farsightedness as well, tho presbyopia is a special term for the age related loss of lens flexibility and thus near focus.

I'm highly myoptic (-11-ish diopters, too much so for good lasik results) with astigmatism (irregular or toric curvature of the cornea or lens, thing American football shaped). Hard (gas-permeable) contacts correct more accurately for the astigmatism and give me a much wider field of view without the peripheral distortion of glasses at the required corrective values. I'm also in my mid-40s and need reading glasses to reduce the contact correction (calibrated for distance vision) by a couple diopters (so to -9-ish, still highly myoptic), thus have personal experience with astigmatic myopia from early childhood, and presbyopia for a half decade or so. Thus my personal knowledge of the subject.

Wikipedia and google of course have more.


Whither btrfsck?

Posted Oct 12, 2011 23:05 UTC (Wed) by gdiffey (subscriber, #65017) [Link]

and you can now do it yourself at home!

Whither btrfsck?

Posted Oct 13, 2011 8:02 UTC (Thu) by hickinbottoms (subscriber, #14798) [Link]

Off topic, but I particularly enjoyed how the guy holding the device on that website is still wearing glasses. Nice touch.


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