What is the default fractional reserve for a thin-provisioned SAN volume?
What is the default fractional reserve for a thin-provisioned SAN volume?
The default fractional reserve for a thin-provisioned SAN volume is 0%. Fractional reserve is the percentage of space that Data ONTAP will reserve in addition to the current data to accommodate overwrites to Snapshot copies, and with thin provisioning, the fractional reserve is set to 0% because space is allocated dynamically as needed.
https://www.netapp.com/us/media/tr-3965.pdf Reading this, it states that in a standard thin provisioned volume the guarantee is set to "none". As NetApp sates in the below article, the default value for fractional reserve is "0%" if the volume guarantee is set to "none" https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-596042AF-8E9C-4187-969C-633DFDD5A936.html
Even in the mentioned resource article it sates, that fractional reserve for thin provisioned LUNs is 0%. https://kb.netapp.com/app/answers/answer_view/a_id/1002243/~/what-is-the-proper-configuration-for-a-volume-containing-a-lun%3F-
Correct is D. First read this https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-C9F36C22-8A46-4D44-B74D-54B56F834D29.html Second read https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-596042AF-8E9C-4187-969C-633DFDD5A936.html
The correct answer is D - 0% https://library.netapp.com/ecm/ecm_download_file/ECMLP2492715 --> page 109
The correct is D
D correct Volume guarantee Default fractional reserve Allowed values Volume 100 0, 100 None 0 0, 100 File 100 100 A guarantee of none allocates space from the aggregate only as it is needed by the volume. This approach to space management is called thin provisioning. The amount of space consumed by volumes with this guarantee type grows as data is added instead of being determined by the initial volume size, which might leave space unused if the volume data does not grow to that size. The maximum size of a volume with a guarantee of none is not limited by the amount of free space in its aggregate.
In my opinion also correct is C https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-596042AF-8E9C-4187-969C-633DFDD5A936.html
The correct is C https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-596042AF-8E9C-4187-969C-633DFDD5A936.html
Agree D, CdotRemo1::> vol show -vserver vs1 -volume vol1 -fields fractional-reserve vserver volume fractional-reserve ------- ------ ------------------ vs1 vol1 0%
I just created one and checked. it is 0 -> D
Answer must be C because: "The default value and allowed values for the fractional reserve setting depend on the guarantee of the volume" "Volume guarantee types can be volume (the default type) or none." As per Link below it must be 100 and therefore answer C. https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-cm-sanag%2FGUID-2F5C9474-FFE9-4E59-84DB-1B9D6D134688.html
the question it is about default fractional reserve for a LUN ; that is 100%. https://library.netapp.com/ecmdocs/ECMP1196986/html/GUID-596042AF-8E9C-4187-969C-633DFDD5A936.html https://www.netapp.com/us/media/tr-3965.pdf LUN overwrite reserve (fractional_reserve) default 100%
ans is C
C is correct Fractional reserve is a volume option that determines how much space Data ONTAP will reserve for Snapshot overwrite data for LUNs and space-reserved files to be used after all other space in the volume is used.. The default value is 100%