On 2013-07-19 3:02 PM, Paul Hartman <paul.hartman+gen...@gmail.com> wrote:
I think you are. Unless you are moving massive terabytes of data
across your drive on a constant basis I would not worry about regular
everyday write activity being a problem.
I have a question regarding the use of SSDs in a VM SAN...
We are considering buying a lower-end SAN (two actually, one for each of
our locations), with lots of 2.5" bays, and using SSDs.
The two questions that come to mind are:
Is this a good use of SSDs? I honestly don't know if the running VMs
would benefit from the faster IO or not (I *think* the answer is a
resounding yes)?
Next is RAID...
I've avoided RAID5 (and RAID6) like the plague ever since I almost got
bit really badly by a multiple drive failure... luckily, the RAID5 had
just finished rebuilding successfully after the first drive failed,
before the second drive failed. I can't tell you how many years I aged
that day while it was rebuilding after replacing the second failed drive.
Ever since, I've always used RAID10.
So... with SSDs, I think another advantage would be much faster rebuilds
after a failed drive? So I could maybe start using RAID6 (would survive
two simultaneous disk failures), and not lose so much available storage
(50% with RAID10)?
Last... while researching this, I ran across a very interesting article
that I'd appreciate hearing opinions on.
"The Benefits of a Flash Only, SAN-less Virtual Architecture":
http://www.storage-switzerland.com/Articles/Entries/2012/9/20_The_Benefits_of_a_Flash_Only,_SAN-less_Virtual_Architecture.html
or
http://tinyurl.com/khwuspo
Anyway, I look forward to hearing thoughts on this...
