Re: What is the point of RAID?
2008/11/12 lee <lee@yun.yagibdah.de>:
> On Tue, 11 Nov 2008 19:54:11 -0600
> Mark Allums <mark@allums.com> wrote:
[snip]
>> If you
>> have a RAID 50 running on 20 SAS drives and 4 hot spares, you better
>> buy quite a few for cold spares, you are going to lose a drive every
>> two months. At least.
>
> You are saying that the age of the drives doesn't matter at all? Then if
> you lose one drive out of 24 every month, that would mean that about 4%
> of all drives sold are junk. The new ones you get could fail within the
> first few minutes ... or not work at all. Or does this mean that it
> takes about one to two months before you find out if a new drive is
> junk? And why don't the drives that are junk fail in the first few
> minutes or don't don't work at all?
Hey,
There have been a few studies re disk drive reliability. This post
links and describes some of them:
http://www.mail-archive.com/kplug-list@kernel-panic.org/msg14771.html
(N.B. the thread is over a year old)
Choice quote from the above post by Tracy R Reed:
"
- - There is no infant mortality phase for drives nor is there a
particular age at which they tend to die (no "bathtub curve" typical for
consumer products). Rate of drive failure is initially low but steadily
increases as they age.
"
cheers,
Owen.
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