FORUMS: list search recent posts

6 TB drives internal on Mac Pro?

COW Forums : Archiving and Back-Up

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
Tom Durham
6 TB drives internal on Mac Pro?
on Apr 28, 2014 at 8:21:50 pm

Greetings Earthlings,

Just wondering if anyone knows how to find out if the new 6TB drives will work internally on older Mac Pros? Late generation PPC and first generation intels? We're thinking of turning our older computers into media archives...

Here's the Seagate:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822178520

Here's the WD:
http://www.simplyhdd.com/6tb-hgst-ultrastar-he6-hus726060ala640-3-5-sata-6g...

Thanks!
-Tom





================================================
YOU can help save TimeSpace. Join the Chronos Protectorate!

http://www.95ers.com
http://www.SpaceAceMedia.com


Return to posts index

Tim Jones
Re: 6 TB drives internal on Mac Pro?
on Apr 28, 2014 at 9:34:18 pm

Hi Tom,

We've got samples of Seagate, WD, and HGST 6TB drives on the way and I should be able to provide definitive answers late in the week.

However, since OS X doesn't have the size problems that we see in Windows and Linux where you need to muck around with 4K block size geometry changes, my suspicion is that they will be plug and play back to OS X 10.5.8.

Don't touch that dial ...

Tim
--
Tim Jones
CTO - TOLIS Group, Inc.
http://www.productionbackup.com
BRU ... because it's the RESTORE that matters!


Return to posts index

Chris Murphy
Re: 6 TB drives internal on Mac Pro?
on Apr 29, 2014 at 12:57:33 am

4KB alignment is a concern with outdated software. Mainly it's Windows XP era software, and some Linux utilities before 2007 that could have an issue. But it's long since patched for 1MB alignments on both Windows and Linux.

On PowerPC computers, it defaults to use Apple Partition Map which I think can handle a 6TB drive like GPT can; but I'm not sure what it uses for alignment off hand.

The bigger issue is whether these are SMR drives, I don't expect them to be suitable for video production at all if they are. Possibly useful as nearline storage instead of or supplementary to tape. Think of it as being like tape for writing with much faster seek times; and equivalent to the random access of a regular hard drive for reads.


Return to posts index


Chris Murphy
Re: 6 TB drives internal on Mac Pro?
on Apr 29, 2014 at 12:38:06 am

If these are SMR (shingled magnetic recording) drives, then this applies:
https://lwn.net/Articles/591782/

If they're SMR, they're device managed at this point so while they will function, they may not function the way you expect when modifying existing files on them. That is there could be a delay. A delay that for normal users may not be noticeable, or if it is not disagreeable; however for video it could cause problems. So you'll just have to test it.

You shouldn't have a problem with anything recent, which would have to use GPT as the partition scheme in order for more than 2TB to be usable. And then also aligning on 8-sector boundaries is the standard. OS X does it exactly on 8-sector boundaries, starting the first partition at LBA 40. While Windows and Linux start the first partition at LBA 2048 which is both 8-sector and 1MB aligned.


Return to posts index

Tim Jones
Re: 6 TB drives internal on Mac Pro?
on Apr 29, 2014 at 1:14:44 am

Chris - please don't muddy the waters unnecessarily here. The drives that we are testing are not SMR drives, but "normal" (in light of what you're talking about) disk drives.

The Seagate Model that we are looking at is the ST6000NM0024. It's a 7200 RPM drive with 128MB cache and is rated capable of sustaining (versus bursting) 216MB/sec (we expect around 180MB in reality) with 1.4 million hours MTBF.

The HGST model (which is also the WD model since WD owns HGST) is the HUS726060ALA640. Also 7200RPM, 64MB/cache and is rated at 177MB/sec sustained (which is what we expect from the Seagate) with 2 million hours MTBF.

Note that NEITHER drive is a desktop drive, so the pricing will probably be very close to $100/TB (don't expect bargains). Both drives offer around 8MS average seek time.

Neither of these drives is an SMR drive, so none of Chris' comments or concerns about that technology will apply.

Tim
--
Tim Jones
CTO - TOLIS Group, Inc.
http://www.productionbackup.com
BRU ... because it's the RESTORE that matters!


Return to posts index

Tim Jones
Re: 6 TB drives internal on Mac Pro?
on Jan 29, 2015 at 4:45:35 pm

A new question has arisen about these drives in retail kits and the fact that you may have issues using the drive out of the box on a Mac system. Files will appear to copy, but they will either appear corrupt or fail to copy.

The normal cause of this situation is the fact that the manufacturers ship the drives formatted as Windows-compatible (MS_DOS, vFat, etc.). The way to fix this is simple - attach the drive to your system, open Disk Utility, Select the Device (rather than the partition), repartition it to a single partition and format it as "Mac OS Extended Journaled". Important Note: This will delete any existing data on the drive.

The drive will now be properly formatted for use with your OS X system.

Tim
--
Tim Jones
CTO - TOLIS Group, Inc.
http://www.tolisgroup.com
BRU ... because it's the RESTORE that matters!


Return to posts index

<< PREVIOUS   •   VIEW ALL   •   PRINT   •   NEXT >>
© 2017 CreativeCOW.net All Rights Reserved
[TOP]