> I have not had much better luck with RAID6 either. No more:
http://baarf.com/
So, what do you suggest if your client needs a big system that can
survive more than one disk failing?
And, if your client needs a really big server ( > 30TB ), what do
you tell them? Do you tell them "you must double your hardware budget
in order to afford an 8U RAID10 system, as I refuse to build a
single-case 4U RAID6 system"?
> ...if you're willing to live with 2TB of space.
I don't understand the argument: "Live with ~half the space and hope
two disks don't fail, because, well, baarf!".
I've seen a couple of >600M/sec RAID6 systems, so RAID6 can be Fast
Enough for many applications.
If you need resilience and space more than performance, what beats
RAID6?
On 01/03/2010 07:17 PM, Robert Woodcock wrote:
On Sun, Jan 03, 2010 at 03:11:25PM -0800, Ryan Allen wrote:
Hi SSL,
I just purchased 4 new 1TB SATA drives, and attempted to upgrade my
RAID 5 system to 3 TB. however my Dell CERC 6 channel SATA RAID card
will only let me build a RAID volume up to 2 TB.
I couldn't find any firmware upgrades on this horribly supported
el-cheepo raid card. At least its been a solid work horse, with
little problems aside from a horrible UI utility called afacli.
I am looking for a hardware RAID card, PCI-X (100MHz), that has an
fairly easy to use UI that is well supported in Linux. It should
also take advantage of ALL my drive space for an expected volume of a
little under 3TB.
Any suggestions? I would like to not spend $550 on an fancy 3ware
card either. Anything in the $100 range?
You may not have much money to spend on this, but surely this data is
important to you?
With a multi-terabyte array, the chance of silent data corruption leading to
later rebuild failure exceeds 50% with RAID4/5. And yes, I have had enough
personal experience for it to be statistically valid. I have not had much
better luck with RAID6 either. No more: http://baarf.com/
You'll have much better luck with RAID1 or RAID10. You could do it with the
equipment you have if you're willing to live with 2TB of space.
You're almost guaranteed to get "fake RAID" in a $100 4-port controller.
You're certainly not going to get a battery backup unit for that, which is
*essential* for decent performance with RAID5.
Oh, and you'll probably want to doublecheck that it really is a RAID card
limitation and not just a partitioning problem - the classic MBR partition
format only supports 2TB drives. You have to use something more sane (such
as GPT) to partition a larger drive.
