Seagate Internal Hard Drive ST8000AS0002 8TB 128MB Cache

chromaniac said:
You would need support. If you are running a business, you cannot rely on suppliers from Delhi for under-warranty replacements. Any possible discount you might get would be negated by shipment costs between the two cities. In any case, if you are generating 40TB of data every month that you do need to store... you would need a constant supplier of hard disks and replacements. 50 drives are unlikely to last you for long considering you would need to create RAID to have multiple copies of same data for reliability. I guess you would also need to create a small scale data center with 24x7 cooling and tech guys monitoring the servers...
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Exactly for this reason, if you're buying it from a single dealer, he'll actually lend you new drives while your old corrupt drives are in RMA process. He'll even recommend you good tech support guys he knows. This is what usually happens in CTC hyderabad. A friend of mine had to buy 8-i7 core systems for his employer and we got a very good deal at CTC hyderabad.
 
10 GbE everywhere. Awesome.

Why are you using RAID 5 with high capacity drives? With large arrays, RAID 5 has a significant risk of failing to rebuild after replacing a bad drive.
 
vedantlath said:
Why are you using RAID 5 with high capacity drives? With large arrays, RAID 5 has a significant risk of failing to rebuild after replacing a bad drive.
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The mission Critical machine needs high speed read and write speed, I didn't wanna go with RAID 0 completely because of no redundancy at all, so I decided to mix it up with RAID 5 + RAID 0 (Nested). Because multiple editors will be hitting this machine, higher read and write is very important for a 4K (and sometimes 5K) video edit.

I understand the risk of using this setup, but that's why I have the low speed archive server (and four drives with a copy of the current project on it in the bank safe), so that I can use those to recover data in an event of a failure.

But is future, (if the budget allows), I will add a mirroring server to the Mission Critical machine on the network, which will sync itself to high speed (mission critical) server every hour (or half hr, if I can get away with it!). And that of course will require more drives. But that's for the future.
 
But I am open for suggestions for the config. My need requires at least 2GB/Sec Read and Write speed from the Mission Critical Server...
 
You should prefer RAID 6 with high capacity drives. The problem with RAID 5 is that when one disk fails, then you replace the disk, then the RAID controller rebuilds the array from other disks. While rebuilding the array, the chance that another disk will fail becomes very high (due to the increased workload and the long time it will take to rebuild the array), and if a disk fails while rebuilding the array, then the whole array is gone. See Why RAID 5 stops working in 2009 | ZDNet , Anton Kolomyeytsev » RAID 5 was great, until high-capacity HDDs came into play, but SSDs restored its former glory and Dell "RAID 50 is not recommended for arrays with 1 TB or larger disks".

As is usual in enterprise, Dell thinks it knows better than you and will not obey you if you want RAID 50 with 3 TB disks: "The Dell Group Manager GUI will not allow for any members with 3 TB or higher to be configured with RAID 50 (firmware 7.0.0 and higher)".
 
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Cool! Thanks for sharing the links. I am new to RAID, do you reckon RAID 6 (+ RAID 0 (nested)) will be able to give around 2+GB/Sec read write?
 
You can use any RAID performance calculator to get an idea of read/write speeds. Try this one. 2 GB/second sustained write sounds pretty much impossible with spinning platters.
 
Okay, while looking for a hard disk for myself, I just realised something: this is the Seagate Archive HDD series, which uses (device-managed) shingled magnetic recording (SMR) to achieve capacity. This is therefore only suited for reads. This is not suitable for workloads where you have a lot of writes. This is also not suitable for RAID arrays unless the stripe size is the same as the SMR band size.
 
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hello
there is shop at nehru palace which is famous for importing alot of stuff from foreign country
i have brought 4TB ext Hdd from them their prices are usu lower then rest of nehru palce whle combine

as your requirement are of 500 units u can try contacting them
www.costtocost.in/list/pricelist.pdf
 
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