Hi
My 2 cents. Before even thinking too much on that path I would check the following
- What the is physical size on those SSD if they are already 4K you won't "save" anything
- Do you use small (>3.5Kb) files? If so I would still keep 4K inodes
- Check if 512 can hold NSDv2 format, from top of my head it cannot but pls check. If so, do you want to use a format that anyway is going to fade away and lose the goodies that format brings?
I am sure few other pros (and cons) can be put on but I would start with those 3
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Ystävällisin terveisin / Kind regards / Saludos cordiales / Salutations
Luis Bolinches
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"If you continually give you will continually have." Anonymous
--
Ystävällisin terveisin / Kind regards / Saludos cordiales / Salutations
Luis Bolinches
Lab Services
http://www-03.ibm.com/systems/services/labservices/
IBM Laajalahdentie 23 (main Entrance) Helsinki, 00330 Finland
Phone: +358 503112585
"If you continually give you will continually have." Anonymous
----- Original message -----
From: Lukas Hejtmanek <xhejt...@ics.muni.cz>
Sent by: gpfsug-discuss-boun...@spectrumscale.org
To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>
Cc:
Subject: Re: [gpfsug-discuss] default inode size
Date: Wed, Mar 15, 2017 2:37 PM
On Wed, Mar 15, 2017 at 08:22:22AM -0400, Stephen Ulmer wrote:
> You need 4K nodes to store encryption keys. You can also put other useful things in there, like extended attributes and (possibly) the entire file.
>
> Are you worried about wasting space?
well, I have 1PB of capacity for data disks and 3TB of capacity for metadata
(SSD).
With 512B inodes, this ration seemed to be quite ok, while with 4k inodes,
I run out of free space on SSD pretty fast. So I'm thinking about re-creating
file system with smaller inode size.
I don't think I will ever need encryption keys.
--
Lukáš Hejtmánek
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