ONTAP Discussions

7-mode deduplication 100%

HenryUK
3,939 Views

Hi All

 

i am working with a FAS2050 with 2.4TB on each controller

 

yesterday we started to enable dedup 1 volume at a time (excluding vol0)

 

vol2 went from 412GB @ 96% to 63% (400GB lun)

 

whihc was a great start

 

today vol3 went from 415GB 94% to 100% (251GB lun) instantly and says snapshot creation failed

 

what would be the reason for this? there are no snapshot copies visable from oncommand

 

any ideas

5 REPLIES 5

aborzenkov
3,924 Views
De duplication creates snapshot internally. So it may happen. The first thing to check would be fractional reserve settings.

HenryUK
3,922 Views

can yo give me some guidance on the commands?

HenryUK
3,916 Views

i see there is an enable fractional reserver 100%

 

i am investigating that now i can just disable this yes?

aborzenkov
3,906 Views
Fractional reserve ensures your LUNs won't suddenly get out of space. Make sure you understand implications before disabling it.

HenryUK
3,874 Views

okay thank you - i have taken off the fractional reserver whilst i run the dedup as there is plenty of space and no backups are performed using storage snapshots

 

when the dedup has completed i will re-enable

 

Cheers

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