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  • Question

  • ooook so here is my delima ive read some of the related questions to this but it didnt really answer my questions. i dont know if im not reading them right or what but w/e
    ok i have a asus board that has 4 sata ports and supports raid 5
    8 gb ram
    quad core
    and i could put up to 7 tb of space in it because im using 4 right now w/ all duplication on
    and we all know that WHS has a data corruptions bug in it that i have been bitten by it on about 20 % of all my pictures 10-15 % of all my isos of cds, games, movies , etc
    here is my ?
    since i could technically set up raid 5 w/ 4 drives and technically WHS would only see it as one drive would the data corruption bug still bite? in my logical thinking...im thinking no because its using "1" drive. also would the raid 5 interfere with the stupid software raid of WHS? the only problem im seeing is after the 4 drives i want to add more and then the bug will start biting is this true?
    Sunday, May 25, 2008 7:24 PM

Answers

  •  David The Lite wrote:
    ahh i get it ... yeah i new they were releasing it soon. i just couldnt wait any longer so i pulled everything fof my old server and started creating the raid 5 server today cuz it just hit me i was like oh duh ! it could be one volume...but i forgot bout the 2 tb limit....that sorta shoots my plan cuz i woul dhave a 3tb volume w/ 2 1 tb drives and 2 500 gb drive but o well i guess i could do the 2 tb one and then wait till they release power pack 1
    The only way to get 3 TB of storage out of that collection of disks is RAID 0, if your controller will even do that. If not, then JBOD is it, which isn't any level of RAID at all. RAID 5 will, at best, get you 1.5 TB, the same as RAID 1 with two mirror sets.

    Please consider reading up on RAID before you try to implement  RAID solution.
     David The Lite wrote:
    And one other ? besides the bug fix what else is going to be in pp1 and why do they call it pp1 instead of service pack 1??!?!
    Windows Home Server Power Pack 1 has been discussed to death in the forums. Please do some searches.
    Monday, May 26, 2008 12:47 AM
    Moderator
  • Nearly, if not all, the RAID controllers I have used will only allow discs of the same size in a RAID group. So with 2 x 1TB and 2 x 500G you can get...

     

    RAID0 - 2 x 1TB = 2TB. No fault tolerance in RAID0 :-( It stripes blocks across the disc members)

    RAID0 - 2 x 500G = 1TB. Again No fault tolerance.

    or

    RAID1 - 2 x 1TB = 1TB. Mirrored. It writes identical blocks to RAID1 member discs, hence you loose half you real disc capacity.

    RAID1 - 2 x 500G = 500G. Mirrored.

    or

    RAID5 - 2 x 500G & 2 x 1TB = 1.5TB. Reason being the smallest sized disc is selected (500GB), and the 2 x 1TB would only be half used. Then RAID5 uses effectivly one whole drive for Parity/ECC, leaving 3 x 500G.

     

    Monday, May 26, 2008 1:05 PM

All replies

  • Windows Home Server is only vulnerable to KB946676 if there is more than one volume (i.e. more than just your system drive) participating in the Drive Extender/storage pool scheme. So if you use a RAID 5 array (not supported, but it works for most who use it) as the only volume you give to WHS, then you would not be subject to that issue.

    There are some trade-offs, though. Windows Home Server uses MBR style partition tables, which limit you to a maximum of 2 TB in that single volume. And it's not easy with most consumer solutions to add storage to your array; you typically have to create an additional volume. Once you do that an give WHS control of it, you're subject to KB946676 again.

    But all that is really moot; when Microsoft releases Power Pack 1 in a month or so, it will include a patch for the data corruption bug. At that point, you don't have to use RAID to protect your data any more.
    Sunday, May 25, 2008 8:46 PM
    Moderator
  • ahh i get it ... yeah i new they were releasing it soon. i just couldnt wait any longer so i pulled everything fof my old server and started creating the raid 5 server today cuz it just hit me i was like oh duh ! it could be one volume...but i forgot bout the 2 tb limit....that sorta shoots my plan cuz i woul dhave a 3tb volume w/ 2 1 tb drives and 2 500 gb drive but o well i guess i could do the 2 tb one and then wait till they release power pack 1


    And one other ? besides the bug fix what else is going to be in pp1 and why do they call it pp1 instead of service pack 1??!?!
    Sunday, May 25, 2008 8:56 PM
  •  David The Lite wrote:
    ahh i get it ... yeah i new they were releasing it soon. i just couldnt wait any longer so i pulled everything fof my old server and started creating the raid 5 server today cuz it just hit me i was like oh duh ! it could be one volume...but i forgot bout the 2 tb limit....that sorta shoots my plan cuz i woul dhave a 3tb volume w/ 2 1 tb drives and 2 500 gb drive but o well i guess i could do the 2 tb one and then wait till they release power pack 1
    The only way to get 3 TB of storage out of that collection of disks is RAID 0, if your controller will even do that. If not, then JBOD is it, which isn't any level of RAID at all. RAID 5 will, at best, get you 1.5 TB, the same as RAID 1 with two mirror sets.

    Please consider reading up on RAID before you try to implement  RAID solution.
     David The Lite wrote:
    And one other ? besides the bug fix what else is going to be in pp1 and why do they call it pp1 instead of service pack 1??!?!
    Windows Home Server Power Pack 1 has been discussed to death in the forums. Please do some searches.
    Monday, May 26, 2008 12:47 AM
    Moderator
  • Nearly, if not all, the RAID controllers I have used will only allow discs of the same size in a RAID group. So with 2 x 1TB and 2 x 500G you can get...

     

    RAID0 - 2 x 1TB = 2TB. No fault tolerance in RAID0 :-( It stripes blocks across the disc members)

    RAID0 - 2 x 500G = 1TB. Again No fault tolerance.

    or

    RAID1 - 2 x 1TB = 1TB. Mirrored. It writes identical blocks to RAID1 member discs, hence you loose half you real disc capacity.

    RAID1 - 2 x 500G = 500G. Mirrored.

    or

    RAID5 - 2 x 500G & 2 x 1TB = 1.5TB. Reason being the smallest sized disc is selected (500GB), and the 2 x 1TB would only be half used. Then RAID5 uses effectivly one whole drive for Parity/ECC, leaving 3 x 500G.

     

    Monday, May 26, 2008 1:05 PM
  • Because WHS relies on MBR disks, you're limited to 2 TB per unit. You can't have 8 TB in one unit or in multiple partitions on one unit.

    Monday, May 26, 2008 9:20 PM
  • i meant in general to have eventually 8 tb i new you couldnt hook up a raid  thats set for 8 tb  i just want to get around the bug for now because i cant wait any longer for the pp1 to come out  because i have lost to much data to the stupid thing  probably about 10 % of all my iso's are corrupt and 1 in every 20 pics i have is messed up. not to mention the countless 12 000 song library i have i dont no if thats messed up or my 700 HD movies
    Monday, May 26, 2008 10:39 PM
  • Thursday, May 29, 2008 11:24 AM