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x3850 storage (HDD & SSD) options

Posted on 2012-03-18
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Last Modified: 2012-03-22
Refer to page 19 of the link/url below:
http://public.dhe.ibm.com/common/ssi/ecm/en/xso03099usen/XSO03099USEN.PDF

Refer to the blue arrow in the attached screen:
does this mean the x3850 can take in a total of 16x 600GB HDDs
plus 2x 640GB SSD or this last column referred to by the blue arrow
in the attached is for x3950 ?

If not, what's the max it can take it, assuming I would like to have
at least 400GB of SSD included.

I noticed there's different models of the x3850, so which model
would allow max storage (with 400GB of SSD) option ?
x3850HDDSSD.png
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Question by:sunhux
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Author Comment

by:sunhux
ID: 37734908
On the last row of the attached, the 2nd & 3rd column indicate
it can take 8x SAS HDDs but the last column indicate it can take
16x HDDs : why is this so?  Or these values are for different
models of x3850 & x3950 ?
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by:andyalder
andyalder earned 390 total points
ID: 37735086
The SSD *adapters* it refers to are PCIe cards and therefore do not take disk bays - http://www.redbooks.ibm.com/abstracts/tips0729.html

Your PDF says "The single-backplane models are upgradeable to 2 backplanes." - that's where the 16 disk bays come in.

You can also bolt two of the servers together with a QPI interconnect cable so I supose you could claim it takes 32 disk bays and 8 CPUs. It's only PCIe 2 though rather than PCIe 3.
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Author Comment

by:sunhux
ID: 37736208
So, what's the largest available 2.5" SAS HDD that can fit into
x3850?  600GB or 300GB?

& the largest available SSD (200GB or 640GB) that can fit into
x3850?
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Accepted Solution

by:
andyalder earned 390 total points
ID: 37736863
According to that doc it takes either 500GB 7.2K NL-SAS or 600GB 10K SAS, however the doc is nearly a year old so you can probably put 1TB SFF 7.2K or 900GB 10K SFF. Hmm, maybe not, looks like IBM haven't qualified them yet, here's their list: http://www-03.ibm.com/systems/x/options/storage/hddstorage/sas/browse.html

I read the doc wrong though, the disk bays are for 4 * 2.5" disks or 8 * 1.8" SSDs, so max 8 SSF disks or 16 1.8" SSDs (or 4 *2.5" + 8 * 1.8" SSDs)

You wouldn't buy a hulking great server like that for the hard disk space though since a 2U server plus a few 2U external disk enclosure would be much cheaper and use less power. http://www-03.ibm.com/systems/storage/disk/entry/index.html#EXP3512 (you'd need another RAID controller in the server with external ports)
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