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Old 17th June 2011
sharris sharris is offline
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Join Date: Jun 2010
Posts: 146
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I guest it really don't matter. If you change even by a few bytes things change. The only good thing is that if you never change size you just go with the best one and use the others for storage or whatever. The results are always consistence with-in each partitions at back-up and clean-up time. Funny, it only took a little over 8 hours to dd-zero the whole disk but it took over 11 hours to dd out the last two partition. I guest for a 1-T drive anything over 500MB falls into the disk geometry black-hole. Also now P1 is faster the original it it is tipple in size AND the first. Either GNU/DD is broke or Seagate HDD mathematics is insane. No wonder they broke the 3-T barrier. For most at lease we know where everything is, how thing work, what to avoid, and what set-up may be best for you. I think I'll stick with the lucky original.

View it as ... 327 GB by LINUX or 300 GB by BSD

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(A) ALL OF DISK:

HD 1 000 204 886 016 bytes | 1 TB 29358 second ..| 8 hour 15 minute |
MB/s = 34.0

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(B) MOST of DISK DIVIDE by THREE:

P1 327 415 463 424 bytes | 300 GB - _3386 second | 0 hour 56 minute | MB/s = 96.7
P2 327 415 495 680 bytes | 300 GB - 21454 second | 5 hour 10 minute | MB/s = 15.3
P3 327 415 495 680 bytes | 300 GB - 21955 second | 6 hour 09 minute | MB/s = 14.9


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(C) DIVIDE FIRST HALF ONLY:

P1 107 479 701 504 bytes | 100 GB - 4383 second | 1 hour 13 minute | MB/s = 24.5
P2 107 479 733 760 bytes | 100 GB - 1140 second | 0 hour 19 minute | MB/s = 94.2
P3 322 432 265 920 bytes | 300 GB - 3493 second | 0 hour 58 minute | MB/s = 92.3

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An EXAMPLE when WRITING SMALLER PARTITIONS:
this make all of the old rules correct again.. plus better speed and in-order:

dd - ad4s1 - 042,952,379,904 - _40.0GB - _360s = _6 minute - 114.0MB/s
dd - ad4s2 - 085,904,824,320 - _80.0GB - _720s = 12 minute - 114.0MB/s
dd - ad4s3 - 214,762,060,800 - 200.0GB - 1900s = 30 minute - _93.0MB/s

.........
40GB as the server partition with 6-minutes restore time! I would use the rest for jails for this kind of set-up. I would use set-up (C) for a PcBSD desktop and much more. With set-up (A) and (B) you loss tooooo much all the way around no matter what (I bet 50/50 is the key here). I wish I had tried that one before final install just completed. dang!

Last edited by sharris; 18th June 2011 at 02:11 PM. Reason: Adding MB/s just re-done. It was not included before.
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