Thanks for the input.
I hadn't even considered 2.5", thank you. The case in the image you sent me looks great because I could conceivably put either 3.5" or 2.5" hot swap bays in manually instead of having them built in. Is that something you can give me a name or a link for or is it just an image?
I am a bit concerned with the lowered maximum capacity of 2.5" drives. I currently use one 4tb 3.5" hard drive for my media collection and have it full to about 2tb. I am not really excited about splitting the collection up among multiple hard drives, but is that something I would have to do? I think I heard somewhere that there is a way to get the computer to treat multiple hard drives as logically a single volume, is that worth looking into? Alternatively I could just designate one drive for "video" one for "music" etc. and subdivide that way to spread it out. I am more a fan of backup than RAID and don't think I'd be using RAID if that is a factor.
I want to make the system as future-ready as possible. I want to have plenty of room for size expansion with the addition of new drives, but I only plan to buy the drives as I go along as the $/gb of storage presumably goes down over time. What you said about 2.5" drives being the future of server storage got me thinking that it might be a good idea to switch for that reason alone. If I buy a case with built-in 3.5" hot swap bays and 2 years from now when I want to buy new drives, the best ones for servers are all 2.5", that would certainly be an issue. I guess no one can really predict the future but do you think maybe with the increasing popularity of 2.5" SSDs and such that 2.5" drives will be the better way to go in the coming years?
I need some advice on what kind of hard drives to get. As I touched on above, I won't be buying enough to fill the thing, but maybe a couple for now and the rest as my need increases. I definitely want reliability and as much storage per drive as possible.
First question - should I go all enterprise grade?
For example this drive I found:
http://
low power sounds nice, not the best transfer rate or cache by a long shot but this is mainly for long-term storage anyway since if I wanted for example to watch a video I could download it to the computer I am going to watch it on rather than stream it. 15mm height is bigger than normal but you said 1.5cm for the hot swap thing you showed me so I assume it would fit. Or is that stupid?
I guess what I'm saying is I looked up the 1tb raptor drive you were talking about and if I got it right it looks like its $300+? What exactly am I getting for that much more money (about 6-8x the $/gb of 4tb hgst 3.5" drive)? Is it reliability? I definitely want drives that won't fail quickly. You said I can avoid SAS that way, but is SAS's lower error rate (read that online) worth it if I have the option?
Anyway thanks for your continued help. The 4-bay hot swap 2.5" thing is brand new to me and looks sweet. I didn't know they sold cases with a bunch of 5.25" trays for you to customize. For example I found this
http://
it had the most 5.25" bays I could find and was reasonably priced, iStarUSA in general has some inexpensive cases like that which are similar, but what you showed me looked completely different so I'm wondering whether I'm on the right track or not. I am a little wary about cases that only have USB 2.0 not necessarily because I can't wait when transferring data from an external drive but because it makes me wonder when it was made and whether there is a newer model I should be looking for. Anyway, as I said above if you have any case links or other parts suggestions I'd be very excited to know.
Hello again,
1- 2.5 inch is already taken over 3.5 inch drives , it is not the future it is today , they are small and short as well and very thin and can reach 2TB at low speed and 1 TB at high speed ... the also consume less power and run cooler and less noisy.
2- you can join all drives as a single big volume , this is called JBOD , they work at same speed no advantage in speed here.
3-in Raid system for fast data transfer, more drives is important , so having a 2x2TB 2.5 , or 4X1TB 2.5 is better than a single 4T in terms of speed .. it will be 2-4x the speed .
4- in Raid you aim at Speed , there are many kinds but for low budget the most common are Raid 0 , Raid 5 , and Raid 6 , and the Mirroring Raid 1 .
-Raid 0 is the fastest eah drive you add doubles the speed of the single drive speed , it splits the data between the drives and write them at the same time and Read them at the same time increasing the speed , but this is not reliable , if one drive fails you will loose all the data. this Raid is easy on the CPU and software raid is enough no need for a raid card , unless you want more ports then you need a SAS Raid Card for large numbers of drives.
-Raid 5 , this Raid sacrifices one drive to save Data , if one drive fails , you stop everything at once , and replace the failed drive , and the Raid software will reconstruct the Data again .. if 2 drives fail at the same time however you will loose all the data .. this raid needs a dedicated CPU to be effective and give you good performance like Raid 0 minus one drive (n-1) performance. the dangerous thing in raid 5 , is that while you are reconstructing the failed drive another drive fails before the reconstructing is finished .. here again you loose all data.
-Raod 6 uses 2 Disks for it .. it is safer and more reliable even if one drive fails , it can handle another drive failing while reconstructing.
-this is in short , you can learn more here
http://en.wikipedia.org/wiki/RAID
http://en.wikipedia.org/wiki/Raid_6#RAID_6
- Raid 1 is mirroring , it mirrors the drive .. here you dont loose the data in your harddisks and have an automatic backup real time without you feeling it , if one drive fails you will be safe , get another drive and the copy mirrored drive to it. even if by hard chance the drive and its mirrored drive fail at same time , you will just loose the data on that particular driver forever , but the other drives will be safe , there is no split files here to worry about ..
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now do you need Raid or not? depends on the people accessing the drive at the same time.. and this is very important THE SAME TIME , not number of users ... if the total bandwidth requested is more than the drive bandwidth , it will slow down ...
The best solution to avoid Raid is picking very fast drives .. like the Raptors I mentioned which can handle 200MB/s , that is like if you raid 0 2x normal slow drive ...
to put you in the picture , here is the comparison betaeen the 10KRPM Raptor drive and regular drives :
http://www.anandtech.com/show/5729/western-digital-velociraptor-1tb-wd1000dhtz-review/2
keep in mind once you use more than 2 drives in raid you will outperform the raptor ...
Now about which drives to use ? better get drives with 3 or even better 5 years warranty and avoid one year warranty drives.. the enterprise ones are aimed at 24/7 raid system , they are a must if your server will work all the time ...
and thats why I like the Raptor , it is a heavy duty class. 10K RPM were only SCSI/SAS drives , actually 15K rpm exist as well (very expensive) when WD brought this 10K rpm to the consumers they made a huge success.. and now they are offering it in 1TB , they are offering fast storage drives for movies without needing Raid 0 for alot of people ... and they pack 5 years warranty as well .
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5- 2.5 drives are not the future they are today
![Smile :) :)](/data/assets/smilies/smile.gif)
and the best seagate SAS drives are 2.5 drives the 15K rpm ones.
6- If you have the cash , get only VelociRaptors 1TB ... if NOT you can go for lower ones but they will be at half speed ... and they have only 2 years warranty vs 5 years on raptors , and small cache 8MB vs 64 MB on the raptors. they are not as reliable , and are slow . and they are the same hight 15mm .
7- Be sure to pick only Sata 3 6Gb/s drives , avoid Sata2 , true both wont exceed the Sata 2 bandwidth , BUT the 64MB cache is a super fast memory , if your file is transfered from the Cache it will transfer at full SATA 3 speed.
8- 2.5 inch drives come in 7mm , 9mm, 12 mm , and 15 mm thickness .. if you use 12 mm drives , you can fit 6 of them in single DVD bay .. thats a crazy number of drives in small space ... but you wont find more than 1.5TB 12mm at lower speed.
the 15mm (can take 12mm, 9mm,7mm as well)
the 12mm (can take 9mm and 7mm as well)
9- be sure when you choose those bays that they support SATA 3 , NOT SATA 2 !!! Avoid SATA 2 models... and be sure they support hotswap.
10- If you pick the 15mm 4x ones , they support all drives thickness below 15mm so dont worry about that . and keep in mind Raptors are 15mm , and 2TB 2.5 are 15 mm as well ... 1.5 TB are 12 mm
11- you pay more for Raptors for 2 reasons , one they are enterprise level with 5 years warranty , and b- they are fast VERY fast .. and they have 64M cache and work on SATA3 , be careful , get only SATA 3 drives ... even the lower ones have SATA 3 .
12- if you are on budget , get lower priced ones .. but expect slow performance . get it 7200 RPM and 32MB cache , you can check the Travelstar 7K1000 , has 32MB cache and works on SATA 3 with 7200 rpm .. for cheap price per 1TB , has 3 years warranty. but is consumer level still. oh and its 9.5mm you can fit 6 of these in one DVD bay
http://www.hgst.com/hard-drives/mobile-drives/9.5mm-mobile-hard-drives/travelstar-7k1000
13- you can go all 3.5 inch if you wish ... if you dont want the Speed and dont want to save space ...but get the enterprise edition with 5 years warranty models only .. the point behind 2,5 beside the small size, is the more harddisks you put in raid the more speed you will get , and using 3.5 inch drives are huge for that .. can you put 6 of them in one DVD bay
![Smile :) :)](/data/assets/smilies/smile.gif)
? actually you can pick up any tiny case and make it a small server with like 12x2.5 drives .. and in mini towers you can put like 32 of them ... but again it is your choice .
14- the case I posted is a real one , and there are many like it , the idea is the door and lock so no one pulls the hotswap drives when you are not around and mess with your server. even the power button is behind the door. and that case is 5U also , you can mount it in a rack.
it is a German made case , Inter-Tech IPC-9008 5U
http://www.inter-tech.de/index.php?option=com_content&view=article&id=712%3Aipc-9008-5u&catid=59%3Aipc-19-zoll&Itemid=627&lang=en
15- if you want the 3.5 route , here is an alternative :
here is a 5x3.5 harddisks in a 3 DVD bays , as you see the comparison to 2,5 bay , in 3 DVD bays you can mount 12x2.5 or 18x2.5 VS only 5x3.5 this is what I meant by saving space ...
for 10 of 3.5 you will need 6 DVD bays ... two of those
http://www.icydock.com/goods.php?id=163
I would never go 3.5 after seeing this lol
for 10 3,5 drives you need full huge tower with 6xDVD bays ...
for 12 drives 2.5 you need only 2xDVD bays found on ANY tiny mini tower..
My advice ? Veloci Raptors and 2.5 bays even at more cost.
here is what 2.5 can give you 32 of them
![Smile :) :)](/data/assets/smilies/smile.gif)
in a DELL server .. as you see t is today not the future
Edit : if you want to make Raid , we talk about Raid cards , but good raid cards are expensive. they start at $300