SC2020 raid10 realocatted to raid5?

JanMracek,

 

There isn't a supported solution to migrate from a Raid 10 to a Raid 5, as seen here there is no migration path from a raid 10, other to expand it. 

 

 

Hope this helps.

 

 

 

Dear Chris,

Are you sure? Now my sc2020 looks like this:

There is a way how to do. In ssh is command what is not on gui which can do.

 Jan

 

 

Hello Jan,

Have you done a raid rebalance on your SCv2020?

Stopppppp!

You have some misunderstanding how the SC works. There is no real pyhs. RAID10/5 on a SC.

Based on the chosen Storage Profile the System use different way how to store and protect the data. There is a mix of Performance or Space efficiency policies available. You can modify and switch the profiles on the fly which effects new data in no time. The old one will be converted over time.

You have mentioned VMFS which means VMware vSphere. You should consider to run  the scsi unmap from your favorite ESXi Host(commandline) on every Datastore which tells the SC which blocks are really deleted and not needed any more. After that process the Data usage for the SC volumes matches the ESXi Datastores.

There is no big deal when youre slowest Tier(3) runs full as long as its only for "reading".

Hint: I have seen RAID tiering problems when huge amount of allocated space arent shifted around within a Tier. Which SCOS version do you run on your SCv2020?

 

Regards,
Joerg

 

Hi,

6.6.11.9 i am have version.

I am happy now, beucase we have disallovated raid10 from tier1 and now its free and can be allocated when we need as r5 r10. 

I am happy now, because i am can spend much more raid10 overhead data to R5. Look for the state before and after:

 

My previously problem, allocated R10 5,26TB is now free and can be used as R5 with small raid over head , not like R10. R10 consume twice. 

This solution spend more space for use. Now i am have non allocated RAID sectors on tier. 
Before i am have R10 allocated with big raid overhead. I am will use all of the raid10 overhead to save data in RAID5.

I am not a hapyy, that the sc2020 have not this operation in gui, or do not doo by self automatically.
For example, when you create volume in tier 1TB , sc2020(SC) allocate 300GB by raid policy on SC. You store data and when you save 75% capacity, SC allocate new sectors. Etc...Etc.. to max configured. But when you delete volume, the acclocated raid secors on tier1 is allocated permanenty. You can´t disaloocated.

And my state is not nice. 5years using SC, have two volumes in R10 and one in R5. When i am switch volume in R10 to R5, nothing happened. Becuase free sectors for R5 does exists. When R5 volume need to save data, SC save to R10 sectors...

Now, i am have only R5 with small R10 part and never plann to use R10.

J.

 

Looks like you havent apply any upgrades in the last 5 years to your SC.  I have seen same problems with our early SCv2020 and Dell support helps to shift some allocated blocks around.

For sure there where huge improvements over the years (think about the 30-40% performance bump with SCOS 7.3) .

Regards,
Joerg