RAID 6 Support

[Kashem]

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

Regards,
Kashem

[Uwe Zessin · Accepted solution]

Today, there is no RAID6 support.

[Khalique]

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

[IBaltay]

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.

[Uwe Zessin]

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.".

[IBaltay]

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 :-)

[Uwe Zessin]

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

[sreekanthtm]

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

[Uwe Zessin]

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.

[sreekanthtm]

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