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Re: Software vs Hardware RAID 10?

Lennart Sorensen wrote:

SCSI has no purpose to me anymore.  SATA or SAS is the only type of
drive I will consider for use.  SAS is really quite impresive, although
I tend to just use SATA for what I do.  I don't run servers in my
current job (someone elses job, and they do use SAS drives).



Don't forget the scsi bus is a serious bottle neck.  If all your drives
at 320MB/s scsi drives, then you have a total of 320MB/s available for
all transfers on that bus.  That's about the same as a single SAS or
SATA drive has for itself.  Parallel scsi is seriously outdated and
fortunately going away quickly now that SAS is available.
Interesting! Unfortunately, this is an existing server, it's all I've got and I have to make the best of it. I would certainly be willing to ditch the Adaptec RAID card if it helped improve things for software RAID. I vaguely know that more SCSI channels is better... however I don't know if motherboards generally have more than one SCSI channel... is there any way to tell that? 

slim:~# lspci -v
00:06.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8111 PCI (rev 07) (prog-if 00 [Normal decode]) 
        Flags: bus master, 66MHz, medium devsel, latency 64
        Bus: primary=00, secondary=03, subordinate=03, sec-latency=64
        I/O behind bridge: 00009000-0000bfff
        Memory behind bridge: fc900000-feafffff
        Capabilities: [c0] HyperTransport: Slave or Primary Interface
Capabilities: [f0] HyperTransport: Interrupt Discovery and Configuration 

00:07.0 ISA bridge: Advanced Micro Devices [AMD] AMD-8111 LPC (rev 05)
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 LPC
        Flags: bus master, 66MHz, medium devsel, latency 0
00:07.1 IDE interface: Advanced Micro Devices [AMD] AMD-8111 IDE (rev 03) (prog-if 8a [Master SecP PriP]) 
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 IDE
        Flags: bus master, medium devsel, latency 32
        I/O ports at ffa0 [size=16]

00:07.2 SMBus: Advanced Micro Devices [AMD] AMD-8111 SMBus 2.0 (rev 02)
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 SMBus 2.0
        Flags: medium devsel, IRQ 10
        I/O ports at cc00 [size=32]

00:07.3 Bridge: Advanced Micro Devices [AMD] AMD-8111 ACPI (rev 05)
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 ACPI
        Flags: medium devsel
00:0a.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12) (prog-if 00 [Normal decode]) 
        Flags: bus master, 66MHz, medium devsel, latency 64
        Bus: primary=00, secondary=02, subordinate=02, sec-latency=64
        Memory behind bridge: fc600000-fc8fffff
Prefetchable memory behind bridge: 00000000f6400000-00000000fc4fffff 
        Capabilities: [a0] PCI-X bridge device
Capabilities: [b8] HyperTransport: Interrupt Discovery and Configuration 
        Capabilities: [c0] HyperTransport: Slave or Primary Interface
00:0a.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01) (prog-if 10 [IO-APIC]) 
        Subsystem: Advanced Micro Devices [AMD] Unknown device 36c0
        Flags: bus master, medium devsel, latency 0
        Memory at febff000 (64-bit, non-prefetchable) [size=4K]
00:0b.0 PCI bridge: Advanced Micro Devices [AMD] AMD-8131 PCI-X Bridge (rev 12) (prog-if 00 [Normal decode]) 
        Flags: bus master, 66MHz, medium devsel, latency 64
        Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
        Capabilities: [a0] PCI-X bridge device
Capabilities: [b8] HyperTransport: Interrupt Discovery and Configuration
00:0b.1 PIC: Advanced Micro Devices [AMD] AMD-8131 PCI-X IOAPIC (rev 01) (prog-if 10 [IO-APIC]) 
        Subsystem: Advanced Micro Devices [AMD] Unknown device 36c0
        Flags: bus master, medium devsel, latency 0
        Memory at febfe000 (64-bit, non-prefetchable) [size=4K]
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 
        Flags: fast devsel
        Capabilities: [80] HyperTransport: Host or Secondary Interface
        Capabilities: [a0] HyperTransport: Host or Secondary Interface
        Capabilities: [c0] HyperTransport: Host or Secondary Interface
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 
        Flags: fast devsel
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 
        Flags: fast devsel
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 
        Flags: fast devsel
00:19.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration 
        Flags: fast devsel
        Capabilities: [80] HyperTransport: Host or Secondary Interface
        Capabilities: [a0] HyperTransport: Host or Secondary Interface
        Capabilities: [c0] HyperTransport: Host or Secondary Interface
00:19.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map 
        Flags: fast devsel
00:19.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller 
        Flags: fast devsel
00:19.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control 
        Flags: fast devsel
02:05.0 RAID bus controller: Adaptec (formerly DPT) SmartRAID V Controller (rev 01) 
        Subsystem: Adaptec (formerly DPT) Unknown device c034
        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 169
        BIST result: 00
        Memory at fc800000 (32-bit, non-prefetchable) [size=1M]
        Memory at fb000000 (32-bit, prefetchable) [size=16M]
        Memory at f8000000 (32-bit, prefetchable) [size=32M]
        Expansion ROM at f6400000 [disabled] [size=32K]
        Capabilities: [44] Power Management version 2
02:09.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet (rev 03) 
        Subsystem: Broadcom Corporation Unknown device 1644
        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 185
        Memory at fc7b0000 (64-bit, non-prefetchable) [size=64K]
        Memory at fc7a0000 (64-bit, non-prefetchable) [size=64K]
        Expansion ROM at fc790000 [disabled] [size=64K]
        Capabilities: [40] PCI-X non-bridge device
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/3 Enable-
02:09.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit Ethernet (rev 03) 
        Subsystem: Broadcom Corporation Unknown device 1644
        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 193
        Memory at fc7e0000 (64-bit, non-prefetchable) [size=64K]
        Memory at fc7d0000 (64-bit, non-prefetchable) [size=64K]
        Expansion ROM at fc7c0000 [disabled] [size=64K]
        Capabilities: [40] PCI-X non-bridge device
        Capabilities: [48] Power Management version 2
        Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/3 Enable-
03:00.0 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b) (prog-if 10 [OHCI]) 
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 USB
        Flags: bus master, medium devsel, latency 64, IRQ 177
        Memory at feafc000 (32-bit, non-prefetchable) [size=4K]
03:00.1 USB Controller: Advanced Micro Devices [AMD] AMD-8111 USB (rev 0b) (prog-if 10 [OHCI]) 
        Subsystem: Advanced Micro Devices [AMD] AMD-8111 USB
        Flags: bus master, medium devsel, latency 64, IRQ 177
        Memory at feafd000 (32-bit, non-prefetchable) [size=4K]
03:05.0 Mass storage controller: Silicon Image, Inc. SiI 3114 [SATALink/SATARaid] Serial ATA Controller (rev 02) 
        Subsystem: Silicon Image, Inc. SiI 3114 SATALink Controller
        Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 177
        I/O ports at bc00 [size=8]
        I/O ports at b880 [size=4]
        I/O ports at b800 [size=8]
        I/O ports at ac00 [size=4]
        I/O ports at a880 [size=16]
        Memory at feafec00 (32-bit, non-prefetchable) [size=1K]
        Expansion ROM at fea00000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 2
03:06.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27) (prog-if 00 [VGA]) 
        Subsystem: ATI Technologies Inc Rage XL
        Flags: bus master, stepping, medium devsel, latency 64, IRQ 11
        Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
        I/O ports at b000 [size=256]
        Memory at feaff000 (32-bit, non-prefetchable) [size=4K]
        Expansion ROM at feac0000 [disabled] [size=128K]
        Capabilities: [5c] Power Management version 2


Thanks again,

/Neil
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