Thread (49 messages) 49 messages, 9 authors, 2007-10-11

Re: RAID 5 performance issue.

From: Justin Piszcz <hidden>
Date: 2007-10-05 10:20:55


On Thu, 4 Oct 2007, Andrew Clayton wrote:
On Thu, 04 Oct 2007 12:46:05 -0400, Steve Cousins wrote:
quoted
Andrew Clayton wrote:
quoted
On Thu, 4 Oct 2007 10:39:09 -0400 (EDT), Justin Piszcz wrote:


 >> What type (make/model) of the drives?
quoted
   >
The drives are 250GB  Hitachi Deskstar 7K250 series ATA-6 UDMA/100
  A couple of things:
    1. I thought you had SATA drives
    2. ATA-6 would be UDMA/133

The SATA-1 versions of the 7K250's did not have NCQ. The SATA-2
versions do have NCQ. If you do have SATA drives, are they SATA-1 or
SATA-2?
Not sure, I suspect SATA 1 seeing as we've had them nearly 3 years.

Some bits from dmesg

ata1: SATA max UDMA/100 cmd 0xffffc20000aa4880 ctl 0xffffc20000aa488a
bmdma 0xff ffc20000aa4800 irq 19
ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
ata1.00: ATA-6: HDS722525VLSA80, V36OA63A, max UDMA/100
ata1.00: 488397168 sectors, multi 16: LBA48
ata1.00: configured for UDMA/100
quoted
Steve
Andrew
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Looks like SATA1 (non-ncq) to me.

Justin.
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