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- Jul 21, 2015
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Ok, so I got my new array set up on Plywood, and I started transferring media over from the old one - but the transfer rate is horrendous. For the first few minutes it was screaming along at 350MB/s, basically maxing out the SATA2 interfaces on the old RAID card, then it dropped down to 45MB/s. Now I know RAID 5/6 have a parity penalty, but the H700 is a decent card and it shouldn't drop that low when the buffer fills up (and the drop occurred after dozens of GB had been copied, the card has a 512MB cache).
I read about the stripe size and cluster sizes causing performance issues when large files are concerned, so I have tried several different combinations (including ReFS) and now ALL transfers are topping out at 45-50MB/s - it doesn't even start fast and slow down anymore. WTF???
HD Tune Pro shows benchmark performance on the H700 to be over 800MB/s read and write and on the LSI to be roughly 300MB/s read and write on an 8GB file (the average size of my media). I'll post screenshots in a bit.
Here's the setup..
SuperMicro X7DBE motherboard
2x Xeon E5430 Quad Core
24GB RAM
Original Array:
3Ware/LSI 9550-8 PCI-X (SATA2) w/BBU (in a 133MHz PCI-X slot)
4x Hitachi Deskstar SATA3 2TB 5900 RPM
New Array:
Dell PERC H700 (SAS2/SATA3) Integrated PCIe x8 (in a x8 PCIe 2.0 slot)
512MB Cache, BBU installed, Write-Back enabled (Dirty Cache light comes on during transfers so cache is functioning properly)
8x Hitachi Ultrastar SATA3 2TB 7200RPM
Connected via 2x SFF-8087 SAS to 4xSATA3 fanout cables
Any ideas?
What stripe size/cluster size/file system should I be using? The video files are large, but each one has associated screenshots/posters/XML files for library purposes, and then there's my music library and programs (mostly ISOs of install media).
I read about the stripe size and cluster sizes causing performance issues when large files are concerned, so I have tried several different combinations (including ReFS) and now ALL transfers are topping out at 45-50MB/s - it doesn't even start fast and slow down anymore. WTF???
HD Tune Pro shows benchmark performance on the H700 to be over 800MB/s read and write and on the LSI to be roughly 300MB/s read and write on an 8GB file (the average size of my media). I'll post screenshots in a bit.
Here's the setup..
SuperMicro X7DBE motherboard
2x Xeon E5430 Quad Core
24GB RAM
Original Array:
3Ware/LSI 9550-8 PCI-X (SATA2) w/BBU (in a 133MHz PCI-X slot)
4x Hitachi Deskstar SATA3 2TB 5900 RPM
New Array:
Dell PERC H700 (SAS2/SATA3) Integrated PCIe x8 (in a x8 PCIe 2.0 slot)
512MB Cache, BBU installed, Write-Back enabled (Dirty Cache light comes on during transfers so cache is functioning properly)
8x Hitachi Ultrastar SATA3 2TB 7200RPM
Connected via 2x SFF-8087 SAS to 4xSATA3 fanout cables
Any ideas?
What stripe size/cluster size/file system should I be using? The video files are large, but each one has associated screenshots/posters/XML files for library purposes, and then there's my music library and programs (mostly ISOs of install media).
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