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тАО09-22-2000 12:38 PM
тАО09-22-2000 12:38 PM
FC60 with No Raid?
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тАО09-22-2000 01:11 PM
тАО09-22-2000 01:11 PM
Re: FC60 with No Raid?
Something seems strange about your calculations. It shows you will only have about 33% usable space out of your raw space. That's too much overhead.
I haven't worked with an FC60, I have a couple of FC30's and I assume they work the same way.
You have 12 disks in each of your arrays. If you have a hot spare you lose 1 disk, 36GB per array. That leaves 11 disks per array, 396GB. That's 792GB total.
There will be waste, or overhead depending on how you partition the disks. I can't see 502GB of overhead.
It sounds like you are creating several small LUNs and maybe counting the mirrors. That's a lot of wasted disk. I would go with larger LUNs and forget the mirrors.
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тАО09-25-2000 10:35 AM
тАО09-25-2000 10:35 AM
Re: FC60 with No Raid?
As far as getting the most usable space (at the cost of performance), Raid 5 is best. For each FC60, you should configure 4 RAID 5 luns - each with 3 disks. If you want a spare, another disk will be needed. This will give you 8X36GB usable per FC60 (4X36GB overhead).
Since the FC60 conroller will be handling the I/O, you will encounter a performance decrease if you let Informix mirror its data.
DBA's always want to control the disk, but with arrays they can't. I suggest a little education here for your DBA(s).
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тАО11-16-2000 08:15 AM
тАО11-16-2000 08:15 AM
Re: FC60 with No Raid?
But if you really want to do that buy a few
LVD SCSI card and use your SC10 enclosures
as a JBOD and through your FC60 raid
controller away.
Your raid 5 storage does seems a bit low.
Make sure that all disk mechs are the same
size in each LUN. (Just like your FC30!)
Later,
Bill
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тАО11-19-2000 11:26 PM
тАО11-19-2000 11:26 PM