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zark
n00b
Joined: 27 Mar 2004
Posts: 74
Location: Belgium
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 Posted: Wed Jan 23, 2008 8:55 am Post subject: SataII NCQ and Software Raid |
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Hello all
My server is currently hitting the freespace limit, and so a hard-drive upgrade is scheduled...
Right now it's running 2x200 gb hdd in software raid mirror (mdadm)
Now, performance wise, it's doing okay, but during peak times the hdd is having a hard time.
I've increased the ram to help this (more buffer cache).
For the new hard-disks, i thought of getting 2x Seagate Barracuda 7200.11 SATA NCQ 3Gb/s - 500 Go 7200 RPM 32 Mo Serial ATA II (bulk).
Big cache, and especially NCQ.
I think NCQ should help relax the harddrives a bit, as we do a lot of streaming.
My server not having sata2 controller, i've located one that is not too bad, and avaiable : Promise SATA300 TX2plus
I've googled around and people seem to have ncq working with that chipset.
My question ...
Will NCQ work in a mirroring software raid setup ?
I'm indeed having doubts about this since both drives read simultaneously from the same drive sectors. if for some reason one drive re-organises the command queue different from the other, will the virtual controller driver notice it and not panic ?
Or will i have to try to find a hardware SataII raid controller on PCI ? (almost impossible, all i found are on PCI-X or PCI-e )
Thnk you |
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lagalopex
Guru
Joined: 16 Oct 2004
Posts: 565
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| Posted: Wed Jan 23, 2008 11:22 am Post subject: |
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You should better look at the Seagate Barracuda ES.2 serie. Its made for servers and the harddisks before that support NCQ, but its improving nothing at all.
But when you are looking for speed and low latency in a server, you may also watch at the Seagate Cheetah 15k.6. But take care these are SAS drives.
In raid it should not make any problems, especially in raid1. |
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gentoo-dev
Apprentice
Joined: 24 Jan 2006
Posts: 172
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| Posted: Wed Jan 23, 2008 11:30 am Post subject: |
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| Have a look at Samsung F1 |
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zark
n00b
Joined: 27 Mar 2004
Posts: 74
Location: Belgium
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| Posted: Wed Jan 23, 2008 11:38 am Post subject: |
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| lagalopex wrote: | You should better look at the Seagate Barracuda ES.2 serie. Its made for servers and the harddisks before that support NCQ, but its improving nothing at all.
But when you are looking for speed and low latency in a server, you may also watch at the Seagate Cheetah 15k.6. But take care these are SAS drives.
In raid it should not make any problems, especially in raid1. |
the ES.2 = 7200.11 
i took care of that
i wish SAS was an option, but way too expensive.
we managed raising 500Euro in donations. and putting an SAS controller + 2 SAS Harddrives of > 300gb is just a no-can-do with such small budget.
do you think the NCQ on the raid1 should give me a performance boost ?
edit: just checked; i was sure the 7200.11 was the same as ES.2 .... it's the ES.2 i wanted, mmmh, damn..
good thing i didn't checkout my order yet ^^
ES.2 = 7200.11 for servers ^^ |
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