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DL380 and RAID --one missed question

 
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scott_417
Frequent Advisor

‎10-18-2005 07:57 AM

‎10-18-2005 07:57 AM

DL380 and RAID --one missed question

What is the Advanced Data Guarding? How is it compared with the RAID x?


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Steven Clementi
Honored Contributor

‎10-18-2005 08:02 AM

‎10-18-2005 08:02 AM

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Re: DL380 and RAID --one missed question

Scott:


RAID ADG is similar to RAID 5 - Parity is striped among all the drives. In this case though, you lose the space of 2 drives instead of 1 as in RAID5.

On a Dl380 with 6 disks, your available space for RAID ADG would be equal to 4 disks.
RAID 5 would be 5 disks.
RAID1+0 would be 3 Disks
RAID 0 would be 6 disks.

RAID ADG is slower performing than RAID5 since it is writing 2 stripes of data instead of 1. You can lose up to 2 disks though and still be operating vs. 1 disk with RAID 5.


Steven
Steven Clementi
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Ivan Ferreira
Honored Contributor

‎10-18-2005 08:14 AM

‎10-18-2005 08:14 AM

Re: DL380 and RAID --one missed question

I prefer RAID 5 with SPARE insted of RAID ADG. This is for performance.

You can loose anyway too disks, but not at the same time, when you loose a disk, the spare disk will reconstruct the data of the failed disk. After the reconstruction, you can loose a disk again.
Por que hacerlo dificil si es posible hacerlo facil? - Why do it the hard way, when you can do it the easy way?
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