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A few tips on picking a UPS for your Mac
Authored by: pub3abn on Oct 11, '05 09:28:26AM
If the UPS battery dies, the power loss to the computer will likely be fatal (HD crash, ...)
While I'm a firm believer in UPS backups, I think this is an exaggeration. I have many firsthand experiences of computers losing power under such circumstances, and have not seen any "fatal" consequences yet. In my experience, there is about a 5-10% chance of data corruption (and a 100% chance that all unsaved data will be lost). But I've never seen any "fatal" hardware failures do to power failure of a protected system.

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Here's a first hand experience
Authored by: lionel77 on Oct 11, '05 07:05:43PM
While I'm a firm believer in UPS backups, I think this is an exaggeration. I have many firsthand experiences of computers losing power under such circumstances, and have not seen any "fatal" consequences yet. In my experience, there is about a 5-10% chance of data corruption (and a 100% chance that all unsaved data will be lost). But I've never seen any "fatal" hardware failures do to power failure of a protected system.

I once had a 200GB FireWire hard drive die on me because of a power outage. A simple head-crash -- there was nothing I could do to recover the data.
Back in the those days a 200GB FireWire drive was about $400. Luckily I could get it replaced because it was still under warranty.

Since then I've been really paranoid about power supply issues.

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Here's a first hand experience
Authored by: justzisguy on Oct 11, '05 11:25:04PM

Pardon my ignorance, but what kind of UPS would kill hardware? Does it not simply turn off once the voltage is ready to dip? Data corruption sure, but I too haven't seen any hardware death as a result of a UPS. Brownouts OTOH, sure.



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Here's a first hand experience
Authored by: lionel77 on Oct 13, '05 05:33:46PM

It's not the UPS killing the hardware, it's the sudden loss of power.
If your hard drive is writing or reading while the power supply is interrupted there is a good chance that you get a head crash and the hard drive becomes physically damaged.



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Here's a first hand experience
Authored by: mauricev on Dec 13, '05 08:04:16AM

Actually, there is virtually no possibility this could occur. When the power is cut to a drive, it automatically parks the head.



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Here's a first hand experience
Authored by: justzisguy on Oct 11, '05 11:25:43PM

Pardon my ignorance, but what kind of UPS would kill hardware? Does it not simply turn off once the voltage is ready to dip? Data corruption sure, but I too haven't seen any hardware death as a result of a UPS. Brownouts OTOH, sure.



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A few tips on picking a UPS for your Mac
Authored by: imageworx on Oct 13, '05 08:51:01AM

You can think whatever you want. But this has happened (and yes, its extreme situation). But if you have no means of powering off a machine that is running off UPS battery, (whether builtin or software controlled) and the power is not restored before the battery discharges, you will damage the device(s).

That is why its been great that you can connect to a UPS and OS X has a builtin power manager. Maybe not as feature-rich as the APC Windows client, but still better than nothing.

Maybe you can test this "exaggeration" for us and leave your most important non-laptop CPU on battery for a few days (hours?) why its running some open programs. Then get back that nothing happened?

---
To BeOS or Not to BeOS



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