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shofmannn
2 Iron

How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Hi is there a easy way to see in Unisphere how the pool was "setup"

for example i want to expand a pool with the same internal Raidgroup config like before but i'm unsure if the pool was setup like

R5 ( 4+1 ) with 3 disks ,4 disks ,5(Recommended) disks ....7 8 9 disks.

Can i deterime it in any way through Unisphere GUI ( without Report Wizard )

Thank you

Tags (2)
6 Replies

Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Highlight the Pool and click EXPAND.

The current disk grouping will be displayed in the RAID Configuration drop down box.

shofmannn
2 Iron

Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Hi Brett. I double checked your input but my Test R5 ( 4+1 ) with 3 disks want to expand by 5 disks

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Re: Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Hi Sebastian, Interesting, perhaps it only displays recommended counts, if you have used them.

Personally, I would grab the info from naviseccli; Do you have access to it ?

naviseccli -h arrayspa -storagepool -list -id # -all | select-string -pattern "RAID Type" -context 1,2

(from a powershell session).

From that you'll get the RAID Type and drive count for each tier.

26-03-2015 8-09-04 PM.jpg

Also, please consider using RAID 6 for NL-SAS drives, the rebuild times are very long.

See attached for all the recommendations.

AlvaroG
2 Iron

Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

From what I see yo actually configure a RAID5 wint 3 disks (2+1) this is not the best practice. As Brett@s tall you should make NL-SAS drives as RAID6:

NL-SAS for Classic RAID6:  4+2 or 8+2

NL-SAS for Pool RAID6: 6+2 or 14+2

When you correctly configure your pool, you should also expand in multliples of the base RAID.

If you create the pool as 6+2, you should add in multiples of 8 disks.

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shofmannn
2 Iron

Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Hi Alvaro, this is only a "TEST Pool" to demonstate that the expand of disks is not equal to the current layout.

I know the BP for VNX ... but as you wrote " you should expand in mutiples of the base RAID" sometimes you need to determine whats the base RAID and expand even if its not BP

Thank you

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cypherstrength
1 Copper

Re: How can i determine whats the Pool design R5 (4+1 ) with 3,4,5,6... disks

Because im OCD, I add to the pool in only the RAID Group Modulus. So for example, a 4+1 R5, ill add 5 disks so I know where the failure domain exists. This is pertinent when doing vertical binding as I only want a single disk per shelf. My .02

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