[lustre-discuss] Lustre Sizing
Jeff Johnson
jeff.johnson at aeoncomputing.com
Mon Dec 31 22:14:19 PST 2018
ANS,
Lustre on top of ZFS has to estimate capacities and it’s fairly off when
the OSTs are new and empty. As objects are written to OSTs and capacity is
consumed it gets the sizing of capacity more accurate. At the beginning
it’s so off that it appears to be an error.
What version are you running? Some patches have been added to make this
calculation more accurate.
—Jeff
On Mon, Dec 31, 2018 at 22:08 ANS <ans3456 at gmail.com> wrote:
> Dear Team,
>
> I am trying to configure lustre with backend ZFS as file system with 2
> servers in HA. But after compiling and creating zfs pools
>
> zpool list
> NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP
> HEALTH ALTROOT
> lustre-data 54.5T 25.8M 54.5T - 16.0E 0% 0% 1.00x
> ONLINE -
> lustre-data1 54.5T 25.1M 54.5T - 16.0E 0% 0% 1.00x
> ONLINE -
> lustre-data2 54.5T 25.8M 54.5T - 16.0E 0% 0% 1.00x
> ONLINE -
> lustre-data3 54.5T 25.8M 54.5T - 16.0E 0% 0% 1.00x
> ONLINE -
> lustre-meta 832G 3.50M 832G - 16.0E 0% 0% 1.00x
> ONLINE -
>
> and when mounted to client
>
> lfs df -h
> UUID bytes Used Available Use% Mounted on
> home-MDT0000_UUID 799.7G 3.2M 799.7G 0% /home[MDT:0]
> home-OST0000_UUID 39.9T 18.0M 39.9T 0% /home[OST:0]
> home-OST0001_UUID 39.9T 18.0M 39.9T 0% /home[OST:1]
> home-OST0002_UUID 39.9T 18.0M 39.9T 0% /home[OST:2]
> home-OST0003_UUID 39.9T 18.0M 39.9T 0% /home[OST:3]
>
> filesystem_summary: 159.6T 72.0M 159.6T 0% /home
>
> So out of total 54.5TX4=218TB i am getting only 159 TB usable. So can any
> one give the information regarding this.
>
> Also from performance prospective what are the zfs and lustre parameters
> to be tuned.
>
> --
> Thanks,
> ANS.
> _______________________________________________
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> lustre-discuss at lists.lustre.org
> http://lists.lustre.org/listinfo.cgi/lustre-discuss-lustre.org
>
--
------------------------------
Jeff Johnson
Co-Founder
Aeon Computing
jeff.johnson at aeoncomputing.com
www.aeoncomputing.com
t: 858-412-3810 x1001 f: 858-412-3845
m: 619-204-9061
4170 Morena Boulevard, Suite C - San Diego, CA 92117
High-Performance Computing / Lustre Filesystems / Scale-out Storage
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