[mythtv-users] Hard Drive reliability esp. RAID issues

[John Drescher]

On Wed, Mar 10, 2010 at 10:18 AM, Travis Tabbal <travis at tabbal.net> wrote:
>
>
> On Tue, Mar 9, 2010 at 4:19 PM, Graham Mitchell <gmitch at woodlea.com> wrote:
>>
>> > Are all drives on the pci-e based sata controllers? What CPU?
>>
>> There are 2 PCIe 1x cards, Sil3132 based, with 2 SATA 3GB ports on each
>> card. Each port is connected to a 5 way port multiplier (so I'm expecting
>> some speed reduction there too). The CPU is an older E2100, running at
>> 2GHz,
>> with 4GB RAM - so not exactly overpowered, but it's only running a minimal
>> FC, and all it's doing is file serving.. Currently there are 17 x 500GB
>> drives connected in a RAID5, and the chunk size is set to 512K, and the
>> stride on the ext3 filesystem is set to 256.
>
>
> My guess is that those controller cards and/or the port multipliers are
> overloaded.

I would say its the port multipliers. Remember a port multiplier can
only handle the full bandwidth of 2 current generation drives any more
than that and you will have suboptimal performance.

John