[CentOS] Poor RAID performance new Xeon server?

Kay Diederichs kay.diederichs at uni-konstanz.de
Wed Jan 14 09:23:29 UTC 2009


Stewart Williams schrieb:
...
> ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata1.00: ATA-7: GB0250C8045, HPG1, max UDMA/133
> ata1.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata1.00: configured for UDMA/133
> ata2: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> ata2.00: ATA-7: MAXTOR STM3250310AS, 4.AAA, max UDMA/133
> ata2.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata2.00: configured for UDMA/133
> ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
> ata3.00: ATA-7: MAXTOR STM3250310AS, 3.AAF, max UDMA/133
> ata3.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata3.00: configured for UDMA/133
> ata4: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> ata4.00: ATA-7: MAXTOR STM3250310AS, 4.AAA, max UDMA/133
> ata4.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 31/32)
> ata4.00: configured for UDMA/133
> 
> Also, it shows 2 of the ports are running as 3.0Gbps (which is strange 
> as I thought all of the ports on the mainboard were the same 1.5Gbps speed)
> 
> The 3 maxtor drives were purchased as SATA2 spec.
> 
> Is there a way to tell what ata?.00 corresponds to sd[a-d]? So that I 

you can identify them easily using e.g. "smartctl -a -d ata /dev/sda" or 
"hdparm -i /dev/sda". Those commands return the model and 
firmware-revision which you then can match against ata1-ata4

> can RAID the 2 faster drives together. Or does the kernel assign in 
> order (e.g. ata2.00 = sdb)? Or won't it make much difference?

it won't make much difference as long as you put two of the three 
STM3250310AS together (preferredly those with the presumably newer 4.AAA 
firmware).
You may be able to switch the two 1.5Gbps drives into 3.0 Gbps mode by 
using vendor tools, but individual drive speeds are below 1.5Gbps anyway.

HTH,

Kay



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