SATA 4TB only showing 2TB

Hi I have previously dealt with issue on a different post where i had been advised that Dell PowerEdge T710 which i have has Dell Perc 6i raid controller which doesnt support 4TB hard drive therfore the solution is that either i buy H700 or H800 or different hard drive.

I have now purchased Dell PERC H700 512MB SAS RAID Controller XXFVX for RAID levels 0/1/5/6/10/50/60

the issue is same it shows 2TB instead of full 4TB. i have 8 hot swap slots and in each it has brand new western digital SATA 3.5 6GB/s

any help will highly be appreciated
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CJIT Consultant Asked:
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DavidPresidentCommented:
Make sure the firmware and drivers are current.
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CJIT Consultant Author Commented:
hi thanks for prompt reply. they are i just updated all the drivers today from dell site.
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Gary CaseRetiredCommented:
There's not a word in the technical reference about supporting drives > 2TB
http://www.dell.com/downloads/global/products/pvaul/en/perc-technical-guidebook.pdf

This page [ http://en.community.dell.com/techcenter/extras/w/wiki/2837.hdd-support-for-2-5tb-3tb-drives-and-beyond ]does indeed reference > 2TB support for the PERC H700 ... HOWEVER (not what you want to hear I suspect), it notes the following:   "...  Dell H700/800 and H200(at a later date) will only support SAS drives. "

So ... to support drives > 2TB you must (a) Have the latest firmware (which you do), and (b) use SAS drives.

I suspect the issue is simple:  You're using SATA drives -- and the H700 firmware only supports drives > 2TB if they're SAS units.
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Lee W, MVPTechnology and Business Process AdvisorCommented:
Keep in mind, if the system doesn't support UEFI, then your BOOT hard drive ("virtual" hard drive presented by the RAID controller) cannot be larger than 2 GB.  Subsequent drives ("D:" and above) can be larger than 2 GB.
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Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
Lee,
"Keep in mind, if the system doesn't support UEFI, then your BOOT hard drive ("virtual" hard drive presented by the RAID controller) cannot be larger than 2 GB.  Subsequent drives ("D:" and above) can be larger than 2 GB."

You definitelly mean 2TB mate, not 2GB, bootong from more than 2TB drive/partition/volume is restricted to GPT disks scheme (partitions scheme) which is supported only by EFI bios type, booting from up to 2TB vol is poossible/supported with normal MBR disk/part scheme.

Best regards
NTShad0w
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andyalderSaggar maker's framemakerCommented:
Almost guaranteed to be old firmware on the H700, see http://en.community.dell.com/support-forums/servers/f/906/t/19508886 for example - 3TB SATA seen as 2TB until H700 firmware upgraded.

http://www.experts-exchange.com/Hardware/Servers/Q_28527579.html 4TB SATA on H700 seen as 2TB until H700 firmware upgraded.

BTW, the GPT/UEFI issue isn't really relevant to physical disks bigger than 2TiB/2.2TB, it's relevant to *logical* disks bigger than that size, you would see the issue with 4 1TB disks in RAID 5 for example and you either use UEFI/GPT or simply create a small logical/virtual disk to boot from and a large logical/virtual disk for data.
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Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
Mate, here some mate have similar problem, solution is a new/correct H700 firmware:
http://www.experts-exchange.com/Hardware/Servers/Q_28527579.html

Best regards
NTShad0w
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CJIT Consultant Author Commented:
Dear Andy and Dawid thank you both. after upgrading i can see 4TB therefore the suggestion of H700 does not support 4TB SATA is wrong
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Gary CaseRetiredCommented:
Glad it's working.   The comment r.e. 4TB support requiring SAS drives was a quote from Dell's technical reference manual: "Dell H700/800 and H200(at a later date) will only support SAS drives. "

Fortunately it was wrong :-)
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Gerald ConnollyCommented:
There is a difference between it working and not being supported.

If a hardware combination is supported, it means that the controller manufacturer has extensively tested the two devices together to help iron out any incompatibilities there might be between the two sets of microcode.
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Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
Glad it's working mate.

Gerald, it's good to remember that in most cases vendor don't test all diaks on the market, and it doesn't mean they will not work and that config is really not supported (sure sometimes is not of course).

Best regards
NTShad0w
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Gerald ConnollyCommented:
Dawid, isn't that the point I was making, yes you can connect any two random devices and they MIGHT work together, but in the context of "being supported" it's only the devices that the manufacturers have tested against each other that are labelled as "Supported" and that they "usually" have a support plan in place for.

Just having a device that conforms to the spec is not good enough, as the spec usually has some grey areas, or optional features that are exploited in different ways by the different manufacturers, thus introducing incompatibilities - a good example of this is the error recovery differences between consumer grade disks and enterprise disks, consumer grade do not normally work well with a RAID controller because they typically go into deep dive recovery stopping all IO for 30 seconds or more, whereas an enterprise disk gives up after 10 seconds or so. The RAID controller will give up on the consumer disk after 15 seconds or so.
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Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
Gerald.

Generally again your point is ok but, one that may use unsupported devs on his own risk, and if he choose to use home green devs/hdd for raid he will go into troubles no matter what devs he choose, but if one will choose NAS devs ,NL devs or enterprice devs that are not on hcl (it's hapeens) not because they not pass tests but because vendor didn't test it, in most cases it will be not very problematic if they are not faulted devs and generally good quality devs. Hcl is a good point for medium and huge business but it's not a static requirement for home/lab/test/soho and smb, but one need to have knowledge what parts should work ok and what will definitelly not work ok. Because vendors don't publish don't compatible hw list so often, it's not mean that it will not work well if one use proper hw for proper task/work/project. In lot of linux projects 90% of hw are not supported because there is no vendor that may do a tests and support it, but it doesn't mean it will not work at all if you still use proper hw for proper task .
For example if your pc mobo vendor dont test all cpu types, especially xeon cpu's it's really not mean that they will not work or work unstable or anythink else, it's just mean that vendor don't test it because of financial analysis that not lot of customers may use their pc mobo with xeon cpu's.
Support and HCL is not a oracle, it's point of knowledge what was tested and works well, but in 95% it doesn't have info what will not work well and why, and evidently it's not mean that all rest of hw will not work well and will have not support, I quite often convert some vendors that they will support some hw config and some not, and if they are small they listen, if they are big they don't.

Regards
NTShad0w
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Gerald ConnollyCommented:
Dawes, not sure what point you are trying to make, you just seem to be saying the same thing I said but in an extremely verbose way, like you are trying to prove you know more about storage than I do.
I understand about qualifying hardware and the difference between something working and being supported (aka HCL) as I used to work for one of the major storage vendors in a depth that made custom devices for customers.
Now I think that we have hijacked this thread enough
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Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
ok Gerald,

We both have some part of right mate.

good for CJ that choose a solution for him.

regards
NTShad0w
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