[ale] They say drives fail in pairs...

[Dennis Ruzeski]

The best way to avoid a raid 5 failure is to use raid 10- Plus you get the
added benefit of no write performance problems.



On Tue, Jan 3, 2012 at 12:41 PM, Jim Kinney <jim.kinney at gmail.com> wrote:

> Jim's RULE of RAID: NEVER, EVER INSTALL RAID DRIVES WITH SEQUENTIAL SERIAL
> NUMBERS!!!
>
> If possible, avoid RAID drive purchases from the same supplier and
> manufacturer.
>
> I was bit once by a RAID5 failure. The lesson I learned is to image ALL
> remaining drives before replacing the failed drive.
>
> Google did research on drive failure rates and recover times and found
> that once a drive is larger than 500GB, a RAID5 system is a bad idea. The
> failure rate of similar age drives (even mixed version, model, etc.) was
> such that the array was likely to fail a second drive before the first
> failure had been recovered from. RAID6 only buys a bit more time as it
> requires a 3 drive failure for data loss. Based on that and my own
> experience, RAID 10 is the only stuff I use now. When the data ABSOLUTELY
> must be available, I use a 3 drive mirror spread across 3 different
> controllers (so, yes, software raid) so typically, the mobo controller and
> 2 additional cards. 12 drives in 4 stripes with 3 copies of each stripe
> makes me happy. It's an especially good setup for write seldom, read often
> servers. The write speed is not sufficient for high-write-throughput
> database stuff so I'd incorporate some SSD hardware for WAL stuff.
>
> On Tue, Jan 3, 2012 at 10:59 AM, Michael Trausch <mike at trausch.us> wrote:
>
>> Well, all I am going to say is thank goodness I'm using RAID 6 and not
>> RAID 5, or all would have been lost for me at the start of the year.
>>
>> I'll write more later, I learned that the Linux kernel is also not as
>> great in handling certain things as it could be.  :-/
>>
>>        --- Mike
>>
>> --
>> A man who reasons deliberately, manages it better after studying Logic
>> than he could before, if he is sincere about it and has common sense.
>>                                   --- Carveth Read, “Logic”
>>
>>
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>>
>
>
> --
> --
> James P. Kinney III
>
> As long as the general population is passive, apathetic, diverted to
> consumerism or hatred of the vulnerable, then the powerful can do as they
> please, and those who survive will be left to contemplate the outcome.
> - *2011 Noam Chomsky
>
> http://heretothereideas.blogspot.com/
> *
>
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