From: Lasse Jensen on 25 Nov 2007 05:18 I have a Dell PowerEdge 2400 with a PERC 2/Si RAID controller onboard (Adaptec 7890 + Intel i960(a)100mhz + 64 mb RAM). I want RAID 5, as RAID 0 with 6 disks is a sure way to loose data and RAID 1 wastes too much space. My problem is that reading performance isn't very good. I get roughly 32 mb/s from the RAID which consists of 6 18 gb 10K RPM SCA disks of different brands and models. The same disks get around 52 mb/s on my other controller, a Adaptec 29160. The two controllers are placed on two different PCI busses. The first one holds all onboard devices, including the PERC and a ATI Rage graphics adapter. The server only runs in textmode, so the Rage shouldn't be able to starve the PCI bus. The second PCI bus has 5 64 bit slots and holds 2 ethernet adapters, one gigabit and one with 4 100 mbit ports, the 29160, sound card and a USB 2.0 card. Chunksize on the PERC is set to 32 kb and the OS'es i've tested with was Linux 2.6.20 and FreeBSD 6.2. How can i improve performance? -- Lasse Jensen [fafler at g mail dot com] Linux, the choice of a GNU generation.
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