2 SCSI HHDs in RAID0 = horrible performance

thegreek

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Dec 26, 2004

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• Apr 17, 2006

• #1

I just put 2 73GB Fujitsu 15K drives in RAID 0 and I get this:

I am using an LSI MegaRaid 320-2E (PCI-E). It's probably a setting in the card that is causing this and I don't know how to fix it. Can anyone help?

 

Rav

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Apr 25, 2001

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• Apr 21, 2006

• #2

Perhaps it needs a driver or BIOS update? Could it be set for a legacy PCI mode? PCI-E should have more bandwidth than that. Are there other devices that might be slowing it? SCSI terminator set correctly?

-Rav

 

EvilT

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In Your MiNd

• Apr 21, 2006

• #3

wow thats fast :O, i agree with rav

 

boris_37

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Jan 10, 2006

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Calgary, Alberta

• Apr 21, 2006

• #4

think of it this way... if you cant fix it at least you have fast seeks..... hahaha

 

Xaotic

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Greensboro NC

• Apr 21, 2006

• #5

Looks like it's running asynch at SCSI-2 rates. Check termination first. Also check that the drives are not jumpered as force SE. Make sure that termination power is enabled on either the drives or the controller. Check the stripe size in SCSI BIOS. Some default configs are as low as 8K and can kill performance. Are the cables and terminators labeled as U320 or U160? Many of the unlabeled cables on the market are lower level SCSI-2 cables and can affect performance. Are the drives on both channels? If not separate them, as there will be no contention issues and you will get better performance. For reference one of my smaller arrays(5 drive RAID-5 on a ServeRAID 6i zero channel attached to an LSI 1030) gets around 200 read and 160 write.

 

OP

thegreek

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• Apr 21, 2006

• Thread Starter
• #6

these are the jumpers for the drives, what should I have plugged in?

 

OP

thegreek

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• Apr 21, 2006

• Thread Starter
• #7

I put each drive on it own cable and jumpped 15+16 on both drives and I get this:

I still have no idea what's going on

 

Martel

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Abbotsford B.C. Canada

• Apr 21, 2006

• #8

boris_37 said:

think of it this way... if you cant fix it at least you have fast seeks..... hahaha

Click to expand...

lol, that is just crool!

 

greenmaji

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Dec 8, 2005

• Apr 28, 2006

• #9

thegreek.. man this is horrible.. I hope the situation as improved with some experimentation (or some googleing of the terms on your jumper set)
were you able to positively identify your cables as U320's?
and why did you jump force LVD mode (I thought that was one of the old SCSI standards like ultra-wide (you know the first one up from standard )
is 23 & 24 jumped?
have you found any manual's to these drives (I seem to remember this particular model being VERY popular server drives there has to be some documentation somewere)

 

infinitevalence

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Nov 14, 2002

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Nashville

• Apr 28, 2006

• #10

What cables are you using? They may not be raited for the full speed. Make sure the terminator is after the last drive on the chain.

 

OP

thegreek

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• Apr 28, 2006

• Thread Starter
• #11

I've been paying around with the controller and switching cables and got this:

Is this what I should expect?

 

infinitevalence

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• Apr 28, 2006

• #12

what is the model number of the drives? a RAID0 should be very close to 2x Min Read with that setup.

edit: It also looks like you have over tweeked or turned off all your caching because your burst speed is no where near what it should be, you should get close to 300MB/s burst.

 

Last edited: Apr 28, 2006

OP

thegreek

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Philadelphia

• Apr 28, 2006

• Thread Starter
• #13

infinitevalence said:

what is the model number of the drives? a RAID0 should be very close to 2x Min Read with that setup.

edit: It also looks like you have over tweeked or turned off all your caching because your burst speed is no where near what it should be, you should get close to 300MB/s burst.

Click to expand...

I'll go back into the controllers bios and see if I did anything with the cache

 

greenmaji

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• May 1, 2006

• #14

@infinitevalence.. Maxtor Atlas 15K 73.4 GB Ultra320 SCSI's.. I dont know wich pin layout they have our Id give you the modle number.

I wouldnt think they would fire up if you dont have the terminatior on the last connection btw.

infinitevalence.. do you have any insite on the jumper settings he should be using from the pic up there?

 

infinitevalence

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• May 1, 2006

• #15

The will work with out a terminator but at reducecd perforamnce. He really shuld leave it all as default except for the SCSI ID that needs to be set in pins 1-8. You could try the Force LVD but i dont think it will help any.