[CentOS] Re: Hard disk recomendation for a software raid 5 array. Does Linux Software Raid support/interacts well with TLER enabled disks.

[Johnny Hughes]

Alexander Georgiev wrote:
>> I have used raid aware and non-raid aware disks for both hardware and software
>> raid. You really want the raid edition drives, as they will send a fail up the
>> channel much faster than a non-raid drive. The non-raid drives will retry over
>> and over, and you stand a chance of data loss while they decide what to do.
>> Software raid will just fail the drive and switch to degraded mode.
>>
>> --
>>
>> MailScanner is like deodorant...
>> You hope everybody uses it, and
>> you notice quickly if they don't!!!!
> 
> Ok, and should I mix disks from different vendors? I have read
> somewhere that this augments the reliability of the array, lowering
> the probability of 2 disks and more go down simultaneously?

Not necessarily from different vendors as much as from different build
lots, etc.

The theory is ... items build from the same components at the same time
and the same place should fail/EOL at about the same time (all things
being equal).

In practice, I have not seen that.  If you are concerned about it,
getting drives from different factories or lots (but the same
manufacturer) should be OK.


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