Re: How do I arrange drives.
- From: Arno Wagner <me@xxxxxxxxxxx>
- Date: 20 Dec 2007 23:47:17 GMT
Previously SpreadTooThin <bjobrien62@xxxxxxxxx> wrote:
I need about 10 Terabytes of storage space.
I see that there are 1 Terabyte disks available.
I'm new to RAID, so please...
As I understand it there are different ways to configure drives in a
raid for redundancy...
If there are 8 bites per byte and one bit for parity and / or
redundancy, then do I need 9 drives to have a full 10 Terabytes? or is
that only 8 terabytes?
8. And take into account that HDD manufacturer use correct SI units,
so that TB would be 1,000,000,000,000 Bytes.
You need 11 drives for a 10TB RAID5. You need 12 drives for a
10TB raid6.
In this configuration if one drive fails it can be replaced and its
contents would be rebuilt?
Yes.
Is that a function of the RAID controller?
Among other things, it should be able to do this.
Do RAID systems always use SCSI drives?
No.
Care to point me in the right direction?
If speed is not an issue, you may wanto to condider software
RAID. If speed is an issue, get a 12 port SATA controller.
Currently 3ware and arcea seem to have the best hardware,
and 3ware seem to have the best support and drivers. Stay
away from Adaptec, they produce high-priced trash.
Consider, e.g., these controllers:
http://www.3ware.com/products/serial_ata2-9000.asp
http://www.3ware.com/products/serial_ata2-9650.asp
For hardware RAID you also want to get a spare controller,
since thay can fail as well. For software RAID, that is not
a concern and a software RAID array can typically be used
on an entirely different computer (with enough controller ports)
without loss of ddata. At least under Linux it is not an issue
at all.
As to redundancy, you may consider RAID6, which can survive a
2-disk loss without loss of data, but costs you the capacity
of 2 disks. Also make sure you have a spare disk handy,
operating a RAID array without redundancy is dangerous.
Arno
.
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