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Recent content by Xon

  1. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    An update for the Windows 8/2012 (64-bit) driver snuck out 11/01/2013; 6.20.00.25. Love the patch notes: "Bug fix low performance issue in storport". Also it appears the latest bios for Supermicro X9SCM-F 2.0b and the areca 1882i bios 1.51 201209 (it was updated after release without a...
  2. X

    Has anyone ever heard NTFS doesn't need defrag?

    The hilarious part is that scheduled "defragmentor" will actually deliberately fragement files. The defragmentor or optimizer as it gets called in later versions cooperates with superfetch which monitors application startup process to re-order file fragements so it can transform random reads...
  3. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    It looks like the ARC-1882i has a firmware regression for dealing with the older 7k2000 Deskstars (well it's either that or my 1882i is damaged), on the upside the beta firmware shows they are at least working to support 4k physical sector drives. The new options for how the card reacts to SMART...
  4. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    I got around todo'ing this. Each drive in passthrough mode worked correctly and on-par with a drive handing off the motherboard with which is the same type & firmware. On 4 disks, I created some RAID6/RAID5 slices which even at 4-10gb took ages to init. and when I tried to delete the...
  5. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    According to hitachi's spec spreadsheet, the 7k3000 deskstar is rated for 24x7 avaliability.
  6. X

    Data integrity: the risks of not using ECC with ZFS (a study)

    This isn't 100% correct. According to the paper here, it is "is more than 8% of DIMM affected by errors per year" and these are correctable errors Looking into the paper: An important take away from this is most DIMMs don't have any errors but without ECC you are going to have a hell of...
  7. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    Yup. I've got 16 2TB 7200rpm Hitachis, in two raid 6 sets of 8 drives each. Both sets have the same massive performance issues regardless if it's a single set attached directly to the controller or both sets via the sas expander (or just 1 set via the sas expander). Even after migrating...
  8. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    Wierd, is how turning on the disk write cache improves read speeds; . I'm probably going to have to RMA the controller, as something is borked with it. I'm planning on see how an Intel G2 SSD performs on each port in pass-through (or a 1 disk raid0) and see if one of the ports is doing...
  9. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    Would anyone have an idea why an Arc-1882i + intel sas expander would be having shockingly slow read speeds off an 8 disk RAID6 2tb Hitachi 7200rpm? ARC-1680lp (v.149 firmware, aka latest firmware): ARC-1882i (latest v1.50 firmware, originally shipped with an earlier version of v1.50)...
  10. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    Make sure the SCSI Ch/Id/Lun for each volumn is different? Areca cards will not present it as an error if there are multipule volumes with the same Ch/Id/Lun, but Windows will only see 1.
  11. X

    Windows 8 Preview / I am playing with Storage Spaces

    This is fundementally impossible with sata over sas. A sata drive simply doesn't have the unique ID which is identifiable over the disk subsystem that a sas drive has, and no amount of smarts with how ZFS/Solaris deals with this can solve it. The only solution is to write that unique ID onto the...
  12. X

    Windows 8 Preview / I am playing with Storage Spaces

    They using stripping as thier mirrored set is actually a RAID10 setup which is smart enough to work on two drives. As you add more drives, Windows 8 is apparently smart enough to only use the least used drive which has a copy of the data you need. There are good solid reasons todo that, and...
  13. X

    Windows 8 Preview / I am playing with Storage Spaces

    On-disk post-processing dedupe is baked into the core OS now, it functions on ReFS & NTFS. Of course the question then becomes at what edition point does it become enabled.
  14. X

    Windows 8 Preview / I am playing with Storage Spaces

    If you are willing to get dirty with powershell commands, there appear to be a bunch documented here. Calling Optimize-Volume should do the trimming & moving to free up space. Something like: Optimize-Volume -DriveLetter H -ReTrim -SlabConsolidate -Verbose Where "H" is whatever the...
  15. X

    ARECA Owner's Thread (SAS/SATA RAID Cards)

    How does this conflict show up? Stuff not working or just degraded performance?
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