holy crap...

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Postby NicholasDWolfwood » Fri Aug 30, 2002 1:57 pm

Haahaha, 227GB? Goddamn, that's a lot...my dad says that there's a way to make two RAID 0s or something, you have to go into the RAID controller's BIOS and change a setting or something..get 2-40GB HDs, or 2-80GBs or something (If you have the IDE controller space), then you'd have enough space.
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Postby ErMaC » Fri Aug 30, 2002 2:16 pm

yes I'm familiar with the intricacies of RAID and it's various levels but I am paranoid about RAID0 due to it's total lack of fault tolerance. If you lose one drive, you lose all your DATA. I currently no longer run a RAID0 because the last time I did one of the drives started getting back sectors and I had no way to fix it because the physical drive had been abstracted from the computer itself so it couldn't see the drive directly.

If I were to run a RAID I'd be running a RAID10 or RAID0+1 in order to have the fault tolerance while still having the performance.
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Postby NicholasDWolfwood » Fri Aug 30, 2002 2:26 pm

I was thinking about that too...that's why I bugged my dad to get me a 120GB HD instead of making 2 40GB HDs RAID0, because I thought to myself that if one of the HDs went bad or something (My last 40GB HD went bad after only having it for about 10 months), then I'd lose all my data, and the RAID was going to be for video data/DVD rips.
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Postby mckeed » Mon Sep 02, 2002 11:34 am

all you do is then set up a raid 5 array which is just stipping with parity. Plus it isn't like you can't recreate that data easily enough.

On a side note.....i can pull of the feat with the evangellion eps ermac. Assuming that you don't need both vobs and avi's on the same drive at the same time....which you shouldn't really anyway. I got two 100GB RAID stripped drives and a 30 GB primary.

Being worried about RAID is kinda silly though.....the odds are the same on drive failure regardless of the amount of drives you got.....you are at the same risk loosing all your data on one drive than a stripepd one. You can do a RAID 5 so you don't lose data when one drive fails....it actaully will rebuid the failed drives contents on the fly on the parity drive and then when you put in a new drive it restores the array so you never loose any data or downtime as you can function even if one drive fails. Pretty fucking cool....a server I put togeather does that and i dirve did fail....and the users never noticed. I got a little email notice from the server telling me it was having issues...at the end of the day shut it down....swap out the drive....reboot and all back to normal.

Pretty cheap to inplement raid 5, just need an extra drive of same size and is cheaper than a raid 0 with mirroring which the new raid cards support, but then you need double the amount of drives. With RAID 5 you only need one parity drive for the whole array regardless of the number of drives, as the odds of two drives failing as a result of normal use between the time you can replace one is very low. If two drives failed at once anyway...mirroring wouldn't really help you anyways. i never keep anything on my RAID 0 array that I couldnt recreate again.

Remember though....nothing beats a good backup.
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Postby ErMaC » Mon Sep 02, 2002 12:14 pm

There's this little problem that RAID5 could never sustain the kind of transfer rates needed to do reading and writing of DV qualty video because of the fact that every time there's a write, it needs to update the parity data. I'm perfectly aware of the presence of it however it's performance drawbacks when you don't use a hardware solution (and there's no way I'm investing money in a RAID card, especially since I don't think I've ever seen an IDE Hardware RAID5 card) make it unfeasable.

And I could also in theory pull it off (actually I could pull of all of it together, DV and VOBs) but as I said I have no desire to delete that much stuff that I use on a regular basis to make the space for it.

And as for the whoel probability thing - the probability for a single drive failure is the same, the difference is if one drive goes it takes the other drive with it.
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Postby mckeed » Mon Sep 02, 2002 1:15 pm

i actually am using a hardware IDE RAID 5 card in the server i mentioned . If you don't do it in hardware you do take a big performance hit. But raid 5 can sustain very high transfer rates though....it essentially is a raid 0 array with a parity drive. and since is it done in hardware you don't take a performance hit to your system as the OS doesn't even know there is a RAID array present aside from the driver. You essentially get RAID 0 performance with piece of mind. Your transfer rates would be detrmined by HD speed anyway as is true with any HD. SCSCI can get up there but many of the newer IDE drives do come very close ad stipping and the cost factor of IDE and you have a very cheap viable solution. I know i can sustain a full DV capture,read,write using the matrox DV codec in RAID 0 and my understanding of how hardware RAID is implemented, and from what i've seen personally from the perfomance, there is a very negligable perfomrance hit, though i don't know how different it is compared with normal DV as I have no experience with that.

I just use the RAID 0 for captureing as it sustains much higher trasfer rates than normal drives. But I got sine nice new high rpm western digital drives it helps.

As far as the loosing the other drive goes......if you mean loose the data yes, but the drive itself is still usable if you reformat or inegrate it into another array. But if you are using it for capture.....you can always recapture what you got or re-rip vob's.
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Postby NicholasDWolfwood » Mon Sep 02, 2002 1:18 pm

My dad just told me about RAID5, and he was looking up IDE RAID5 cards on eBay, but because I have a mini-ATX case, the bigger RAID5 cards won't fit in my system. So much for that idea, ghhhh...
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Postby AbsoluteDestiny » Mon Sep 02, 2002 1:19 pm

mckeed wrote:you can always recapture


I lost the entirety of the unreleased Utena that I captured off Laserdisc.

I had no means of getting access to the LDs again.

It sucked.
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Postby mckeed » Mon Sep 02, 2002 1:25 pm

ok.....i assume that if you capture....you would normally have access to the source again to recapture. But then you could have lost your data on a normal drive anyway. The argument here was safety of data on RAID 0 vs. non-RAID or at least that is what i thought it was.
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Postby AbsoluteDestiny » Mon Sep 02, 2002 1:40 pm

mckeed wrote:But then you could have lost your data on a normal drive anyway.


But on a normal drive I'd have only lost half - it was the fact that I had a HUGE HD full of useless data that I couldnt recover that pissed me off more than the other one going.
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Postby mckeed » Mon Sep 02, 2002 4:53 pm

ahhhhh....yes that is bad.....that is why backups are your friend
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