[mythtv-users] Reassemble RAID with mdadm
phillip.p.barnett at gmail.com
Fri Mar 19 13:43:41 UTC 2010
I've got 320 disks in an Avid ISIS (not strictly RAID, but obscure
algorithmic data spreading) array running 24/7, and lost about 3 in
the past year, so about 1% a year.
Granted these disks are probably not consumer grade, but I put 4
Maxtor disks in two Tivos in 2001, and they're still running, and
actually recording every second of every day since.
Sent from my iPhone
On 19 Mar 2010, at 12:40, John Drescher <drescherjm at gmail.com> wrote:
>> On a modern CPU, there is a theoretical slowdown calculating
>> parity, but
>> my quad core runs about 5% of one core when I'm thrashing the
>> drives hard.
>> Frankly, any modern system has CPU to burn, and I don't believe
>> calcs are a real-life impact on performance.
> Agreed. Even on 5 year old systems the cput hits 7% max unless the you
> are rebuilding or reshaping then it can hit 25% on 1 core..
>> RAID5 is the most space/cost efficient. You get n-1 space, so with
>> a 5
>> drive array, you get 4 disks worth of space.
> Agreed again
>> I had a lot of problems with RAID5 and consumer grade disks. My
>> disks are
>> generally failing about 1 every 3-6 months, in a 6 disk array.
>> Which makes
>> sense if you figure the life of a drive is 2-3 years. My theory
>> here is
>> that consumer grade drives are made to a budget. They give a 3 year
>> warranty, but they're assuming you don't run it 24x7.
> There is something very strange here. I have 100+ such disks in raid
> and I see 1 to 3 total failures per year running 24/7/365. And these
> are systems that I guarantee are used more than your Mythtv box.
> mythtv-users mailing list
> mythtv-users at mythtv.org
More information about the mythtv-users