RAID10 not working in install
Mike Wright
mike.wright at mailinator.com
Mon Feb 25 21:29:14 UTC 2008
Bill Davidsen wrote:
> Alan Cox wrote:
>
>>> The raw read speed on a RAID1 array is the speed of a single drive.
>>> The
>>
>>
>> No. A smart raid1 driver will use both source disks. The raw write speed
>> is that of the slowest drive (plus overhead).
>>
>>
>
> Does this mean that the Linux software RAID is not smart, or there's a
> way to make it actually do this? Current FC[678] doesn't seem to be
> "smart."
>
>> RAID 10 gives you better write throughput which on a modern PC normally
>> means that with PCI Express your bridge/memory bandwidth becomes the
>> limit.
>>
>>
>
> This is what I measure running an E6600 CPU and 3xSeagate 320 with
> Recent FC7 kernel. All reads and writes to the raw array using dd, 1MB
> buffer, 1GB i/o to/from /dev/{zero,null} for raw speed. Units are MB/s,
> 64k chunks, speed as reported by dd.
>
> RAID lvl read write
> 0 110 143
> 1 52.1 49.5
> 10 79.6 76.3
> 10f2 145 64.5
> raw one disk 53.5 54.7
Sorry to butt in but what does 10f2 mean/stand for?
tia, :m)
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