Doesn't understand Avamar util%

Question

Hi all, I'm having problems understanding the Capacity util in Avamar. Our current grid consists of the following 6 x 7.8 TB nodes = 46.7 TB. The util % is about 23.7 = approx 11 TB of used capacity. Accordingly to Avamar we are protecting about 15 TB of data which I understands to be the amount of data that Avamar scans every day. If you calculate backend dedupe ratio its a bit higher that a 1:1 ratio. I know that because of the retention and Avamar makes everything into a full backup that the logical amount is alot higher. I trid to run a backend capacity report of everything on the grid and the result was around 8 TB. As I understand the backend report it tells you if what you have choosen would be alone on the grid. What I don't understand is when I run a backend report of everything on the grid and the backend report tells me that this would only take up 8 TB and the util% tells me that I'm using 11 TB what is the last 3 TB used for??? As I understand the Util % is amount of TB that you actually can store backups on. Checkpoints and so on is not part of this util, correct? Can somebody clarify this for me?

Sandeep_Sinha · Answer

Hello,

You should refer to the output of status.dpn to check the user capacity utilization, that is the space utilized by backups.

Can you please paste the output of status.dpn

Here is an article you can check to know about the details of Avamar User and OS Capacity Management :

http://solutions.emc.com/EMCSolutionView.asp?id=esg118578&usertype=C

broeste1 · Answer

So basically if I look at the output from the status.dpn is says around 15.3% util on all nodes. So if a calculate that I get the following

0,153(Highest util) x 46,7 (Avamar total capcity) = apporx 7.15 TB of used backup storage capacity.

I'm I understanding this correctly?

Then my other question is why is the Avamar GUI providing me with the wrong info? I suppose that the 15.3 % is out of the backup storage capacity and not the entire storage capacity? with OS, CP and so on

Accordingly to the article you provided then maybe to util % provided in the Avamar GUI is included with the space reserved for CP? It just doesn't make sense if that's the case.Should the CP take up about 3 TB. I wouldn't imagine!

85% |---------------------|

| Reserved for |

| checkpoint |

| overhead |

65% |---------------------| <-- 100% User Capacity

| Commonality | Can be monitored

| factored data | from the Admin

| & RAIN parity | GUI.

| data |

| |

0% |--------------------- |

broeste1 · Answer

Hmm, I cannot paste in my entire output from status.dpn

here is the most important

0.0 192.168.255.2 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 2 false 0.01 32057 1277160 15.3% 15%(onl:1204) 15%(onl:1180) 15%(onl:1183) 15%(onl:1175) 15%(onl:1169) 15%(onl:1203)

0.1 192.168.255.3 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 1 false 0.01 32057 1283519 15.2% 15%(onl:1186) 15%(onl:1192) 15%(onl:1183) 15%(onl:1183) 15%(onl:1200) 15%(onl:1188)

0.2 192.168.255.4 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 1 false 0.01 31933 1283843 15.2% 15%(onl:1186) 15%(onl:1179) 15%(onl:1189) 15%(onl:1192) 15%(onl:1188) 15%(onl:1191)

0.3 192.168.255.5 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 0 false 0.08 32060 1265111 15.3% 15%(onl:1179) 15%(onl:1193) 15%(onl:1182) 15%(onl:1205) 15%(onl:1179) 15%(onl:1193)

0.4 192.168.255.6 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 1 false 0.09 32057 1199156 15.2% 15%(onl:1188) 15%(onl:1185) 15%(onl:1175) 15%(onl:1193) 15%(onl:1194) 15%(onl:1200)

0.5 192.168.255.7 6.1.0-333 ONLINE fullaccess mhpu+0hpu+0hpu 1 false 0.11 32061 1196048 15.3% 15%(onl:1180) 15%(onl:1179) 15%(onl:1193) 15%(onl:1181) 15%(onl:1185) 15%(onl:1200)

broeste1 · Answer

I just read the article once more and that kinda answered some of my question but not the original question

"

The "100% User capacity" marker in the diagram (also known as the read-only limit) indicates that up to 65% of the total space in the data partition is available for storage of de-duplicated backup data. The space below this 100% User Capacity marker is equivalent to the "Server Utilization" value which is visible in the Administrator GUI. . If the amount of deduplicated data stored on any data partition on any node reaches 65% then the Avamar system will become read only and will not accept further backup data.

We can now understand therefore that, from the Avamar Administrator GUI, the user has visibility of how much space is taken up by backups but they do not have visibility of how much space is used up in the OS data partitions."

That means that the Server util that I see in the GUI is how many % of the server capactiy currently used. Which then brings me back to the first text i posted.

sorry this is a bit confusing for me

Sridhar246 · Answer

15.3% utilization that you got from output of status.dpn considers the complete OS partition space. If you divide that number with 0.65 (100% user capacity mark) and multiply with 46.7 TB then you get 11TB.

(0.153/0.65)x46.7 = 11 TB

Not sure if that answers your question though.

If I understood your first post correctly you are backing up 15 TB worth of client side data and it is occupying 11TB on Avamar?

broeste1 · Answer

Hi, Yep, that's correct we are scanning about 15 TB worth of client side data and it is occupying 11 TB in Avamar.

Avamar

Was this post helpful?