topic Re: volume nearly over deduplicated in Active IQ Unified Manager Discussions

volume nearly over deduplicated

mdvillanueva — Thu, 05 Jun 2025 06:42:04 GMT

Hi experts,

i received an alert that one of my volume is nearly over deduplicated. i can edit the threshold but i am curiious. I have read that this is a good thing?But is there any drawback to it at all? Meaning a volume getting over deduplicaated?

Thanks,

Maico

Re: volume nearly over deduplicated

adaikkap — Thu, 03 Nov 2011 13:05:15 GMT

HI Maico,

The only problem is, if the volume is over deduplicated, and if you wish to un-dedupe the volume would not be able to hold the data.Thats the only downsized I know of.

Regards

adai

volume nearly over deduplicated

mdvillanueva — Fri, 04 Nov 2011 00:16:50 GMT

Thank you!

Re: volume nearly over deduplicated

RBLT_GLOBAL — Fri, 15 Jun 2012 22:06:57 GMT

So, in essence, as long as you can reclaim enough space in the aggregate by reducing the other flex volumes, to allow for the "used" + "saved", you could deduplicate the volume if necessary?

I have increased the dfm thresholds by 10% each from original installation settings already, and will probably do another 5-10% increase, but I'm trying to understand the correletion between 50% saved and 150% deduplicated as shown below? ( it appears the event was triggered during the last pass of sis )

KLNAS1-1> sis status /vol/KW_N1_F1_A1_V7_JDE1_R

Path State Status Progress

/vol/KW_N1_F1_A1_V7_JDE1_R Enabled Idle Idle for 14:24:10

KLNAS1-1> df -hs /vol/KW_N1_F1_A1_V7_JDE1_R

Filesystem used saved %saved

/vol/KW_N1_F1_A1_V7_JDE1_R/ 597GB 587GB 50%

Thanks,

Rick

Re: volume nearly over deduplicated

RBLT_GLOBAL — Fri, 15 Jun 2012 22:15:01 GMT

is it as simple as the following? ( in a case where df - s reports 50% savings on 1000GB data )

df -s shows deduped savings as a percentage of undeduped data ( 500 used, 1000 data, therefore 500saved/1000 = 50% ), while

dfm option OverDeduplicatedThreshold is calculated by undeduped data as a percentage of deduped space usage ( 1000undeduped / 500 used = 200% )

Just hoping to confirm/clarify.

thanks,

Rick