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Check if your FS is aligned with RAID dimensions. I'm getting 320MB/s on RAID-6 array with 8 x 2TB SATA drives on XFS and I think it is limited by 3Gb/s SAS channel rater then RAID-6 performance. You can get some ideas on alignment from this threadthis thread.

Check if your FS is aligned with RAID dimensions. I'm getting 320MB/s on RAID-6 array with 8 x 2TB SATA drives on XFS and I think it is limited by 3Gb/s SAS channel rater then RAID-6 performance. You can get some ideas on alignment from this thread.

Check if your FS is aligned with RAID dimensions. I'm getting 320MB/s on RAID-6 array with 8 x 2TB SATA drives on XFS and I think it is limited by 3Gb/s SAS channel rater then RAID-6 performance. You can get some ideas on alignment from this thread.

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Check if your FS is aligned with RAID dimensions. I'm getting 320MB/s on RAID-6 array with 8 x 2TB SATA drives on XFS and I think it is limited by 3Gb/s SAS channel rater then RAID-6 performance. You can get some ideas on alignment from this thread.