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2309
October 21st, 2015 17:00
DD670 Active Tier
We have a DD670 with a ES30 added on. It shows 18.39 TB available /data:post-comp.
Active Tier shows 10.9TB.
We plan to use it as a media device for Commvault to store backups on.
What does this Tier stuff mean? What happens when we exceed 10.9TB? Does it get moved? Do I need another license to use the rest of the space?
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jbrooksuk
208 Posts
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October 26th, 2015 01:00
Hi,
Yes to your first question - it's all in the Active tier - on your system specifically you have one Active tier with controller disks and one shelf providing that useable capacity.
No, you won't have archive tier in a DD670 and your output doesn't show this - so all good.
You will have only the default active tier for this model and this is shown in your extract.
You buy a DD670 and it can store your backup data on the 12 internal 1Tb disks (not all DD models can AKA data-less head).
You also then need a shelf license when you add a shelf (that gives you the additional ~10.9Tb).
What your extract is showing you is just 2 different RAID groups (disk groups=DG) DG0, which is the RAID group on your DD670 controller (which is always enclosure 1, 670 has 12 disks here) with a spare in slot 5, so 1.5.
Then you have DG1 in your first and only shelf, this is enclosure 2, it has 15 disks made up of 1Tb disks, your spare is in the default last slot (slot 15), so 2.15.
When you added this shelf, you would have had the ~8Tb useable from the head showing in the FS (Active tier).
You will have added a license for the new shelf.
You will have added the shelf by command line or GUI, which creates the RAID group and prepares the shelf to become part of the active tier filesystem.
Then you will have performed a "filesys expand", this will add all prepared shelves (in your case ONE) to active tier filesystem and expanded it LIVE and online to increase your storage from 8Tb useable (from the controller) to the ~18.39Tb you see now - all in the active tier. Controller+shelf=18.39Tb useable from theoretically 27Tb raw disks (12x1Tb AND 15x1Tb ES30 shelf).
Note; when you have archive tier - you will see an archive tier listing the capacity separately under Active tier, also an archive tier license (extended retention is it's name these days) and the shelf license will be for an "archive shelf" not an "active shelf".
You can see all these licenses with the command;
license show.
Does that make more sense?
Regards,
Jonathan
Your system looks exactly how I would expect and as specified in the documentation.
jbrooksuk
208 Posts
0
October 22nd, 2015 01:00
Hello,
DD670 has 12TB of raw internal disks (in the DD670 controller).
It can have up to 64TB of raw storage connected in external shelves.
The useable space is different to the raw space.
The DD670 controller provides around 8TB useable.
An external shelf will provide 10.9Tb useable when it has 1Tb disks.
Collectively the internal and external shelves provide your ~18Tb useable space, which will both be placed into the active tier.
Active tier is the default filesystem provided on all Data Domains, unless they have purchased an archive tier license, which creates a second filesystem which is used to move data from the active tier to the archive tier by policy.
The DD670 does not support Archive (now called extended retention).
I think perhaps you read the active tier details for the external shelves only - maybe under "storage show all"?
Here is an extract from a DD670, sadly I can only seem to find one with 2x ES30 shelves, which have 2TB disks.
So, this is showing 2x 21.8Tb useable shelves externally, whereas yours will show 10.9Tb only (plus the internal storage).
Storage Show All
----------------
Active tier details:
Disk Disks Count Disk Additional
Group Size Information
------- ----------------- ----- ---------- -----------
dg0 1.1-1.5, 1.7-1.12 11 931.5 GiB
dg1 2.1-2.14 14 1.8 TiB
dg2 3.1-3.14 14 1.8 TiB
(spare) 1.6 1 931.5 GiB
(spare) 2.15 1 1.8 TiB
(spare) 3.15 1 1.8 TiB
------- ----------------- ----- ---------- -----------
Current active tier size: 51.8 TiB
Active tier maximum capacity: 51.8 TiB
Shelf Capacity License:
License Model Total Used Remaining
--------------- ----- -------- -------- ---------
CAPACITY-ACTIVE ES30 43.6 TiB 43.6 TiB 0.0 TiB
--------------- ----- -------- -------- ---------
Does that help with your query?
Regards,
Jonathan
EdHabal
4 Posts
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October 22nd, 2015 12:00
Does this mean everything is Active Tier? Active tier details: Disk Disks Count Disk Additional Group Size Information ------- ----------------- ----- ---------- ----------- dg0 1.1-1.4, 1.6-1.12 11 931.5 GiB dg1 2.1-2.14 14 931.5 GiB (spare) 1.5 1 931.5 GiB (spare) 2.15 1 931.5 GiB ------- ----------------- ----- ---------- ----------- Current active tier size: 19.1 TiB Active tier maximum capacity: 19.1 TiB Shelf Capacity License: License Model Total Used Remaining --------------- ----- -------- -------- --------- CAPACITY-ACTIVE ES30 10.9 TiB 10.9 TiB 0.0 TiB --------------- ----- -------- -------- ---------
EdHabal
4 Posts
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October 23rd, 2015 11:00
" Active tier is the default filesystem provided on all Data Domains, unless they have purchased an archive tier license, which creates a second filesystem which is used to move data from the active tier to the archive tier by policy."
A license was purchased for the 10.9TB useable on the ES30. So what does that make the other 8TB?
Should we remove that license so everything becomes Active Tier?
EdHabal
4 Posts
0
October 26th, 2015 12:00
Thanks for the clear description.