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23 Posts
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1313
Data all in RAID10 wanted in RAID6
We set up our storage center wrong, and didn't notice until we had only 4 drives out of 10 writing, that's when we realized it was writing in RAID10.
We thought we could migrate this data to RAID6 but can't seem to figure out how to do it, we crated a new storage profile which has Tier 1 write RAID type as RAID 5 / RAID 6 and have the storage profiles assigned to the volumes which previously were set to High Priority Tier 1 profiles.
How do you get the data to migrate from RAID10 to RAID6? We have our storage types set up as dual redundant and applied to the volumes also at that level.. if you go into the modity tier redundancy it has RAID10DM RAID6-10 listed and virtually all the data is allocated to RAID10DM
DELL-Bob Mi
230 Posts
0
June 22nd, 2019 07:00
Hello BSH-RESCH,
First, are you taking Snapshots on your system? A snapshot (or replay) is a point-in-time copy (PITC) of a volume which is used by the system to identify older data that can be moved to a lower tier. By default data will write to Raid 10 and Snapshots are sent to Raid 5/6. If you take a Snapshot on each Volume the data will be moved down to Raid 5/6 of Tier 1 immediately.
Second, is Data Progression licensed? If Data Progression is not licensed and a system uses snapshots, data is migrated between RAID types within a tier (drive class) but cannot be migrated between tiers. For data progression to work properly, there must be at least a daily replay and an hour overlap for replay expiration. If only a single daily replay is being taken, the minimum expiration time should be 25 hours.
BSH-RESCH
23 Posts
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June 22nd, 2019 19:00
Yes we have daily snapshots running with an expiration of 7 days per snapshot
We do have data progression licensed. But every day we get a alert "Progression failure".
We currently only have one tier of storage also, we just purchased this system and put 10x 2.4 SED 10K SAS drives to start off with, all are Tier 1 storage.
DELL-Bob Mi
230 Posts
0
June 25th, 2019 10:00
I suspect that Data Progression is not able to complete every night which is why you see the "Progression failure" message. Check to see if you are limiting the amount of time for DP to run. Page 234 of the Storage Manager 2018 R1 Administrator’s Guide under Schedule or Limit Data Progression
https://topics-cdn.dell.com/pdf/dell-storage-manager_administrator-guide3_en-us.pdf
BSH-RESCH
23 Posts
0
July 1st, 2019 05:00
We had dell Pro Plus support look at the issue, even they seemed confused... they tried to re-stripe the drives and that didn't work the first couple times they tried... they eventually did something after a couple days of trouble shooting and now we seem to be at the point we wanted it to be at