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colinw

Drive performance varies from bay to bay

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colinw
Posted (edited)

I’ve been running some benchmarks on my ssd drives, one is over 500mb/sec read and write, which is correct, but the other is only 280mb/sec read and write.

 

The two ssd drives in question are the same make and model fitted in two of the slots on the front bay.

 

any ideas why, this is in ahci mode.

 

 

Edited by colinw
Not enough info

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colinw

It seems bays 1 & 2 are running at the correct 500mb/sec, but bays 3 & 4 are running at 280mb/sec ?

 

Should they not be all at full speed.

 

I am running the OS in bay 1, all in ahci mode using the standard Microsoft hard drive controller driver.

 

any ideas please.

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colinw

Ok done some reading on here and it seems the first two bays are Sata 3 (6gb) and the second two are Sata 2 (3gb) so that explains what the benchmark testing is showing.

 

is there any way of adding another two Sata 3 ports to this server ?

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korby
4 minutes ago, colinw said:

Ok done some reading on here and it seems the first two bays are Sata 3 (6gb) and the second two are Sata 2 (3gb) so that explains what the benchmark testing is showing.

 

is there any way of adding another two Sata 3 ports to this server ?

Yes, the first 2 bays are SATA III and the other two are SATA II.

 

If you want more/all drives with SATA III you could use a PCIe controller, something with SFF-8087 SAS.

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colinw
Posted (edited)

Ok thanks for the reply, so if I get a pci express card do I connect the main Sata cable to this card instead of the motherboard.

 

Update: I can’t seem to find a card with this type of connector any more.

Edited by colinw

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schoondoggy

You would need to move to a RAID card or a HBA to get a SFF-8087 port.

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colinw

Ok thanks I have been looking but not 100% what I’m looking for to be honest.

 

preferably I would like to stay in ahci mode and run all the front drives as Sata 3.

 

i did not realise (or maybe I even forgot) at first that only two ports run at Sata 3 when I started getting the ssd drives so would like the faster read / write speed for these drives.

 

thanks.

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schoondoggy

You could add a HBA like this:

https://www.ebay.com/itm/SAS9207-4I4E-LSI-6GB-S-8-PORTS-PCI-E-3-0-SAS-SATA-HOST-BUS-ADAPTER-LP/253937005699?epid=1342137380&hash=item3b1fd33483:g:oIcAAOSwPF9chG3U

Connect the 4 front bays to the LSI would give you AHCI SATA 6Gbs. You could use the first two ports of the onboard SATA controller running at 6Gbs to run SSD's in the ODD bay.

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colinw

Thanks just trying to find something locally in uk. 🙂

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