[mythtv-users] Migrating RAID

Brian Wood beww at beww.org
Sun Nov 4 00:31:24 UTC 2007

Rudy Zijlstra wrote:
> Dan Ritter wrote:
>> On Sat, Nov 03, 2007 at 05:10:38PM -0600, Brian Wood wrote:
>>> Rudy Zijlstra wrote:
>>>>>>> A lightning strike might take them both out, especially if the
>>>>>>> cable is copper. Can you replace it with a fiber-optic link?
>>>>>> Or just use a surge protector for the CAT5 cable on each end.
>>>>> That's not going to work. 
>>>>> -dsr-
>>>> Can you explain why not? installing surge protectors i can, exchanging 
>>>> to fiber-optic is much more difficult, as i would have to learn how to 
>>>> make the connector on the fiber cable..... Also, i run big risk of 
>>>> damaging a fiber cable when pulling it into place :(
>> Brian gave a good explanation.
>> You can buy premade fiber cables of varying lengths.  100 meters even
>> is not unusual.
>> You'll want to run it through a conduit of some sort, but --
>> aren't you running the copper through a conduit now? Otherwise I
>> would assume that you will be replacing it several times a year
>> -- lawn mowing, for instance.
>> -dsr-
> It is running though a conduit.. which is pretty full. Which means i 
> have no space for the connector to pull through :(
> Also, inside i have to go through some small spaces, and increasing 
> space for this is a major work :(  Cat 5e cable can stand quit a bit off 
> pulling, and sharp corners. Not so certain on fiber optic cable in that 
> respect.
> hmmm, could do it for a short run, simply to have the isolation. Do not 
> care too much about a device being fried. Problem with an almost direct 
> hit is, i am rather afraid it would not only fry the switches at both 
> ends of that cable, but might actually continue on through those 
> switches onto the rest of the network.

As I said, in the event of a direct hit your network will be the least
of your problems, you likely wouldn't have any computers left to use it.

Nothing can help such a disaster, and I'd worry more about your house
burning down.

There are optical isolators available, to break the copper continuity,
but I really don't think it's worth it in your situation. You could even
microwave the signal of the distance is short. There are industrial T1
RF hops available, but expensive. I'm sure you ae aware of the
limitations of 802.11(x), but it does have its uses.

If you are really really concerned about data loss, an off-site B/U in
another state or continent is always good. Burning to optical media then
moving the disks off site works as well.

The equation is simple: Figure out what it would cost to replace your
data, and don't spend more than that "protecting" it.


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