expandind raid6 on Adaptec 52445 question

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PAo_ReVoLT

[H]ard|Gawd
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hi i have Adaptec 52445 which is running raid6 24x1TB now it is fulled i need more space is it possible add another card then add another 24TB drive on the second card then make it 48TB array? or i have to get 1.5TB drive?

thx
 
Some cards support spanning arrays across multiple cards, but I would not recommend it with the number of drives you plan on using. I would create another separate array. If you really want to do it that way however, it would probably be easiest to get one of those Chenbro SAS expanders.
 
http://www.adaptec.com/en-US/products/Controllers/Hardware/sas/performance/SAS-52445/

on the web site it say "Up to 256 SATA or SAS devices using SAS expanders" so i ned SAS expanders and 1 more Adaptec 52445 or just the expander by it self could you guys explaining me more on the SAS expanders please

thank you for ur help in advance

* by the way i need 1 big drive as i need all my data on 1 drive so i just cant separate it
 
You just need the SAS expander. I still recommend against having 48 drives in an array. You don't want to find out firsthand that RAID doesn't protect your data...it only gives uptime. I still don't see why you can't split the data. You can always mount the drive array as a folder within another drive (if you are using NTFS).
 
may be i will get 1.5TB x 24 in raid-6 then

thanks anyway

ps. what is the reason you wouldn't recommend 48 drives array?
 
Few things. Expanding from 24 to 48 drives will take a long time and leaves you liable to multiple failures (since the drives are being hammered constantly). Same with rebuilding the array. Drives get hammered constantly and your risk of multiple drive failure goes up since you have so many (and since it takes even longer now). I bet a few people here can share their experiences of the array being destroyed during OCE or rebuilding.
 
DO NOT put 48 drives in a single array, you would just be asking for trouble. It would take forever to oce/rebuild and even with raid 6 there would be a very high chance of drives crashing and loosing the entire array.
 
How many is too many? After reading this thread, it got me thinking.

I was planning on Raid 6 and maybe having one drive as a hot spare. Maybe two hot spares?

Is 16 drives in Raid 6 reasonable?

For me, this is for home use. Media. Not mission critical work stuff.

Thanks for the advice.
 
many ppl run 20-24 drive raid 6 arrays with no issues.
Personally i have 20 drive raid 6 with 1 hot spare
I would say anything over 24 is asking for trouble, personally i would stop at 20 especially if there is no adequate backup.
 
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