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SATA III speed with N40L & RocketRAID 2720SGL possible?


DanneQuo
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I cannot get more than SATA II speed with the RocketRAID. Is it possible at all? At least closer to 5Gbps than 3?

 

OS: Ubuntu Server 12.04 64bit fully updated

Kernel: 3.2.0-39-generic

RAM: 8GB ECC

SAS kernel module: libsas v + mvsas v0.8.16 (discovered and used automatically)

RR 2720SGL, firmware @ v1.5 (PCIe x8, 5Gbps)

Disks: WD 3TB red (SATA III)

Original SAS/SATA cabling

 

I get avg ~117MB/s per drive, and all four red's simultaneously gives avg ~426MB/s, using udisks benchmark.

 

Disks are recognized by RR as SATA600 with firmware v1.5, but SATA300 with v1.0 for some reason.

 

Kernel logs look ok:

  mvsas: PCI-E x8, Bandwidth Usage: 5.0 Gbps

 

compared to integrated controller:

  AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3f impl SATA mode

 

All disks are recognized:

   5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)

  4096-byte physical blocks
  Write Protect is off
  Mode Sense: 00 3a 00 00 
  Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  Attached SCSI disk
 

Any ideas?

 

//Danne

 

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I cannot get more than SATA II speed with the RocketRAID. Is it possible at all? At least closer to 5Gbps than 3?

 

OS: Ubuntu Server 12.04 64bit fully updated

Kernel: 3.2.0-39-generic

RAM: 8GB ECC

SAS kernel module: libsas v + mvsas v0.8.16 (discovered and used automatically)

RR 2720SGL, firmware @ v1.5 (PCIe x8, 5Gbps)

Disks: WD 3TB red (SATA III)

Original SAS/SATA cabling

 

I get avg ~117MB/s per drive, and all four red's simultaneously gives avg ~426MB/s, using udisks benchmark.

 

Disks are recognized by RR as SATA600 with firmware v1.5, but SATA300 with v1.0 for some reason.

 

Kernel logs look ok:

  mvsas: PCI-E x8, Bandwidth Usage: 5.0 Gbps

 

compared to integrated controller:

  AHCI 0001.0200 32 slots 6 ports 3 Gbps 0x3f impl SATA mode

 

All disks are recognized:

   5860533168 512-byte logical blocks: (3.00 TB/2.72 TiB)

  4096-byte physical blocks
  Write Protect is off
  Mode Sense: 00 3a 00 00 
  Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
  Attached SCSI disk
 

Any ideas?

 

//Danne

 

First off I am not sure that you will get much more than 117/MBs off the RED drives so you may actually be getting all there is to get.  SATA 3 is only fully exploited on SSD's.  Most physical drives will not come close to saturation.  You may not have an issue at all.

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The spec sheet for the red drives lists 145MB/s Data transfer rate Host to/from drive (typical).  Those numbers appear to be verified at least by the first review I found searching for WD Red atto results.

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RAID-0 would give you the best performance, at the greatest risk to your data. I wouldn't even consider RAID-0 unless 1) I truly need the extra performance and 2) I have a very robust backup strategy in place.

 

The question you need to ask is, "Am I worried about the performance because I truly need it, or am I just bugged that I'm not using SATA III to its fullest?". If it's the latter, I wouldn't worry about it. My 2 cents.

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The spec sheet for the red drives lists 145MB/s Data transfer rate Host to/from drive (typical).  Those numbers appear to be verified at least by the first review I found searching for WD Red atto results.

 

That's been my experience with Reds:

 

gallery_1229_39_40234.jpg

gallery_1229_39_47225.jpg

 

Note though that ATTO and CDM above were run in Windows OS.....  so 117 in udisks on Ubuntu Server may very well be in the right ball park. 

Edited by Joe_Miner
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:o ...obviously. Thanks for stopping me from any more troubleshooting  :P

 

 

To summarize: using the RR to increase red raid speed was totally not worth it  :)

 

Bonus benchmarks pics:

 

Single 3TB red read-only benchmark thru RocketRAID:
 

28iahbm.png

 

Single 3TB red thru integrated controller:

 

s5wqy0.png

 

9TB raid 5 (4x3TB red), md-raid through integrated controller:

 

34xgrgz.png

 

Same 9TB md-raid thru RocketRAID:

 

v3n23b.png

 

12TB raid 0 (4x3TB red) through integrated controller:

 

2mq7nsl.png

 

Single 250 GB through the esata-port:

 

28jz4h4.png

 

 

 



"[...] or am I just bugged that I'm not using SATA III to its fullest?".

 

Guilty  :ph34r:

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I would certainly agree that you are probably as good as it gets.  I would also agree that it is probably not worthwhile for single mechanical drives but is worthwhile if you are going to create a RAID 0 or RAID 5.  Nice charts BTW.

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