PE2950, LSI SAS -> SATA very slow

Dan Pritts danno at
Mon May 3 16:42:21 CDT 2010

On Fri, Apr 30, 2010 at 04:29:28PM +1000, Adam Nielsen wrote:
> We have a PowerEdge 2950 with an "LSISAS1068E" controller, hooked up to 
> two Seagate 1TB SATA disks.  For some reason the performance of these 
> disks is quite poor - I'm lucky to get over 10MB/sec from them, when I 
> should be getting closer to 100MB/sec.

I have an LSI-brand SAS card with a similar chipset:

85:01.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X Fusion-MPT SAS (rev 02)
        Subsystem: LSI Logic / Symbios Logic Unknown device 30e0
        Flags: bus master, 66MHz, medium devsel, latency 72, IRQ 66
        I/O ports at d800 [disabled] [size=256]
        Memory at fe4fc000 (64-bit, non-prefetchable) [size=16K]
        Memory at fe4e0000 (64-bit, non-prefetchable) [size=64K]
        Expansion ROM at fe200000 [disabled] [size=2M]
        Capabilities: [50] Power Management version 2
        Capabilities: [98] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
        Capabilities: [68] PCI-X non-bridge device
        Capabilities: [b0] MSI-X: Enable- Mask- TabSize=1

it's in a sun x4200 running RHEL5, and it's been used with various SATA
disks with no issues.

Dan Pritts, Sr. Systems Engineer
office: +1-734-352-4953 | mobile: +1-734-834-7224

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