Total usable space #2

[screamer]

Hello guys,

i didn't want to hijack another thread, so i created another one :)

i had created 6x3TB Raidz-2 volume but i miss almost 2TB on it, latest freenas version.



i'm new to freenas and unix, so maybe i had misconfigured something.

yes i know, that volume is almost full, but firstly i want to resolve missing 2tb problem.

PS, ashift: 12

or this is expected, as i can read from here? https://bugs.freenas.org/issues/10937

 

[Jailer]

Doesn't look like anything is missing to me.

 

[solarisguy]

I am reading http://blog.delphix.com/matt/2014/06/06/zfs-stripe-width/ and looking at https://docs.google.com/spreadsheet...jHv6CGVElrPqTA0w_ZY/edit?pli=1#gid=1576424058 ( I got there through https://bugs.freenas.org/issues/10937 )

Could someone please enlighten me where the FreeNAS defaults are?

So far, I memorized that

RAID-Z requires a bit more space for parity and overhead than RAID-4/5/6

 

[danb35]

i had created 6x3TB Raidz-2 volume but i miss almost 2TB on it,

The calculator says you'd have 10.9 TiB of capacity, less 0.175 TiB of overhead, or 10.7 TiB. Your screen shot shows you have 9.4 TiB used and 1.1 TiB available, which add up to 10.5 TiB. Where do you see 2 TB missing?

 

[screamer]

Thank's for reply's guys,
Total RAID space is listed ~16TIB but i have only ~14TIB, or i compare wrong numbers?

 

[solarisguy]

Well, actually not well, as you might not like the answers given in the other thread
https://forums.freenas.org/index.php?threads/total-usable-space.38778/page-2

You can change your dataset recordsize property to 1M, in order to get more disk space. (But read the other thread first!)

 

[danb35]

You are comparing the wrong numbers. If you look at the column headings (which you cropped out of your screenshot), the column where you've underlined 14.1 TiB is the space used. The next column (which shows 2.1 TiB in your screenshot) is the amount of space available. Add them up and you have 16.2 TiB.

And your pool is too full--it should be under 80%.

 

[Lordadmiral Drake]

You have 6*3TB drives, that gives a raw capacity of 18TB
You've configured them in RAID-Z2, therefore 2 are used for parity, that leaves 12TB of space
Now, a ZFS shouldn't be filled over 80% (FreeNAS actually gives you a warning if you do that)
This leaves you with a "usable" capacity of about 9.4 TB in the end.

Of course, you CAN fill a ZFS volume to the brim, but then things can happen (Don't ask me what, though)

 

[screamer]

Of course, you CAN fill a ZFS volume to the brim, but then things can happen (Don't ask me what, though)

Hi, yes i currently have the whole zfs volume full becouse i migrate old hard drives to ZFS, when all the data migrated, i'll replace hard drives with larger ones and extend the volume size.
but, if i may ask, what bad things can happen if my whole ZFS volume is full? i lately had already zfs volume full and recovered it with ECHO commands, as the only problem i had, impossibility to delete files.m
i did read that there will be performance drop, but i didn't notice this, as ia have stabel 90MB/s over cifs
can the whole zfs volume broke?
i do have default setup, and each hard drive had some reservations, i'll check them later.