topic RAID 6 Support in Disk Enclosures

RAID 6 Support

Kashem — Wed, 12 Nov 2008 04:46:37 GMT

Hi,
Would you mind informing me which eva (4400/6100/8100) support RAID 6.

Regards,
Kashem

Re: RAID 6 Support

Uwe Zessin — Wed, 12 Nov 2008 05:41:22 GMT

Today, there is no RAID6 support.

Re: RAID 6 Support

Khalique — Mon, 17 Nov 2008 10:00:16 GMT

VRAID 0, 1 ,5 and cross Vraid snap is supported on EVA. VRAID 6 support is not available yet.

Re: RAID 6 Support

IBaltay — Mon, 17 Nov 2008 10:07:36 GMT

Hi,
RAID6 is the less powerfull from all parity RAIDs. It is used in the XPs but the penalty of the double parity write is not ideal for the on-performance oriented design.

Re: RAID 6 Support

Uwe Zessin — Mon, 17 Nov 2008 10:29:07 GMT

But some customers are interested in safety. This is very important for less-reliable, high-capacity disk drives. I know one IT manager who declared: "I won't buy any storage array that can't do RAID-6. Period.".

Re: RAID 6 Support

IBaltay — Mon, 17 Nov 2008 10:34:31 GMT

From this strict customer request we can come to the conclusion that MSA 1000/1500 with ADG (RAID6) is safer then EVA which is a nice paradox :-)

Re: RAID 6 Support

Uwe Zessin — Mon, 17 Nov 2008 10:53:12 GMT

I agree ;-)
But I don't/did not sell MSA1500cs/MSA20 combinations anyway.

Re: RAID 6 Support

sreekanthtm — Mon, 17 Nov 2008 11:05:30 GMT

Hi,

Everybody says RAID 6 is not supported.... Why?

RAID-6
Striped data with dual distributed parity
RAID-6 is the same as RAID-5 except that it uses a second level of independently calculated and distributed parity information for additional fault tolerance. This extra fault tolerance provides data
security in the event two drives fail before a drive can be replaced.
While this RAID level does provide greater fault tolerance than level 5, there is a significant loss in
write performance due to the requirement for storing parity twice for each write operation. A RAID-
6 configuration also requires N+2 drives to accommodate the additional parity data, which makes it
less cost effective than RAID-5 for an equivalent storage capacity.

Its just a copy paste ferom the attchmnt... :-)

Rgds
Sreekanth

Re: RAID 6 Support

Uwe Zessin — Mon, 17 Nov 2008 11:12:30 GMT

Sreekanth,

the question in this thread is whether a certain set of HP EVA storage arrays provide support for RAID-6 [=have implemented it], not what RAID-6 is or wether some other arrays have it.

Re: RAID 6 Support

sreekanthtm — Mon, 17 Nov 2008 11:15:13 GMT

Its already answered in the first line ( by you) All other comments are just value add....Let him understand why its not supported? and why others are not worried about it.

Rgds
Sreekanth

Re: RAID 6 Support

Uwe Zessin — Mon, 17 Nov 2008 11:31:33 GMT

In this context, 'not supported' means that no currently sold EVA has *implemented* RAID-6. The EVA simply *CAN'T DO* RAID-6.

It DOES NOT mean that the controller firmware could do it, but somebody at HP says: "don't use it / if you use it but have problems - don't call us, because we will not help (support) you".

Re: RAID 6 Support

Santhosh D — Thu, 19 Feb 2009 05:09:19 GMT

Hi..

Good News to you!!

By March end, HP is releasing a new product series in EVA i.e EVA 6400/8400 and this product line supports RAID 6

Cheers!