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тАО05-24-2011 12:49 AM
тАО05-24-2011 12:49 AM
Raid 5 Question ?
Is anyone know how work the netraid5 volumes.
in 4 nodes Cluster , the provisionning size for one volume (full provis.)is the same for a Netraid10 or netraid5 (single parity)volume ?
I don't find documantation about this.
Thanks
Didier DANEL
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тАО05-25-2011 11:10 AM
тАО05-25-2011 11:10 AM
Re: Raid 5 Question ?
With network RAID 10 (before it was called replication level 2) with 4 nodes you will loose 2 nodes because of the RAID 10 replication.
With network RAID 5, 3 nodes will be used to write blocks of data, the 4th node will be used for the parity block.
So with RAID 5 you have more effective space available as with RAID 10. With RAID 5 you loose the disk space of 1 node, with RAID 10 it is 50%.
FYI RAID 5 is possible from 4 nodes on, RAID 6 is available starting from 6 nodes...
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тАО05-25-2011 08:53 PM
тАО05-25-2011 08:53 PM
Re: Raid 5 Question ?
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тАО05-25-2011 09:17 PM
тАО05-25-2011 09:17 PM
Re: Raid 5 Question ?
I don't understand , because if 3 nodes are used for data blocks and one node for Parity block , only 25% of space shoulf be lost.
thanks
Didier D.
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тАО05-26-2011 01:18 PM
тАО05-26-2011 01:18 PM
Re: Raid 5 Question ?
Can you provide some screenshots?
I assume you created a single site cluster and not a multi site?
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тАО05-26-2011 07:21 PM
тАО05-26-2011 07:21 PM
Re: Raid 5 Question ?
I would recommend n/w RAID 5 only is your rate of change of the volume is 0-10%/day
Mostly Archival volumes, Large File shares, Remote Copy in DR Sites.
Volumes are mostly Read.
It delivers approximately 60% utilization of raw disk capacity assuming disk RAID 5 in storage nodes plus Network RAID 5 across nodes.
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тАО05-26-2011 09:26 PM
тАО05-26-2011 09:26 PM
Re: Raid 5 Question ?
I will take screenshots asap.
Yes the cluster is standard .
do you have some documents or white papers about block distribution for Raid5 ...
thank you
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тАО05-27-2011 01:29 PM
тАО05-27-2011 01:29 PM
Re: Raid 5 Question ?
But it is simpel:
RAID 5 is 3 data blocks and & parity block (parity blocks spread accross the 4 nodes)
RAID 6 is 4 data blocks and 2 parity blocks
(parity blocks spread accross the 6 nodes)
I'll see if I can find public documents with the drawings...
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тАО05-27-2011 08:38 PM
тАО05-27-2011 08:38 PM
Re: Raid 5 Question ?
can you to send me the internal pointer
didier.danel@hp.com
Thank you
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тАО06-02-2011 12:47 AM
тАО06-02-2011 12:47 AM
Re: Raid 5 Question ?
Hope it helps.
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