[gpfsug-discuss] Biggest file that will fit inside an inode?

[Simon Thompson (Research Computing - IT Services)]

TCT doesn't use dmapi though I thought?
________________________________________
From: gpfsug-discuss-bounces at spectrumscale.org [gpfsug-discuss-bounces at spectrumscale.org] on behalf of Luke Raimbach [luke.raimbach at googlemail.com]
Sent: 03 October 2016 17:07
To: gpfsug main discussion list
Subject: Re: [gpfsug-discuss] Biggest file that will fit inside an inode?

Surely it wouldn't go? Maybe the data would get copied out rather than stubbed... DMAPI can't be stupid enough to stub data out of an inode? Can it? Interesting question.

Maybe I'll test that one.

On Mon, 3 Oct 2016 at 17:00 Simon Thompson (Research Computing - IT Services) <S.J.Thompson at bham.ac.uk<mailto:S.J.Thompson at bham.ac.uk>> wrote:

Would you tier an in-inode file to the cloud?

I mean, I wouldn't tier an in-inode file out to tape?

Simon
________________________________________
From: gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org> [gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org>] on behalf of Oesterlin, Robert [Robert.Oesterlin at nuance.com<mailto:Robert.Oesterlin at nuance.com>]
Sent: 03 October 2016 16:56
To: gpfsug main discussion list
Subject: Re: [gpfsug-discuss] Biggest file that will fit inside an inode?

What's going be taken away if you use Encryption or Transparent Cloud Tiering?


Bob Oesterlin
Sr Storage Engineer, Nuance HPC Grid


From: <gpfsug-discuss-bounces at spectrumscale.org<mailto:gpfsug-discuss-bounces at spectrumscale.org>> on behalf of Marc A Kaplan <makaplan at us.ibm.com<mailto:makaplan at us.ibm.com>>
Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Date: Monday, October 3, 2016 at 10:46 AM
To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org<mailto:gpfsug-discuss at spectrumscale.org>>
Subject: [EXTERNAL] Re: [gpfsug-discuss] Biggest file that will fit inside an inode? 3968!!

On a non-SELINUX system the answer is 3968 of data in a 4K inode, just 128 bytes of metadata.

Caution: it's possible in some future release, this could change ... I don't know of any plans, I'm just saying ...

Inode 16346892 [16346892] snap 0 (index 12 in block 255420):
  Inode address: 6:123049056 size 4096 nAddrs 330
  indirectionLevel=INODE status=USERFILE
  objectVersion=1 generation=0xC0156CB nlink=1
  owner uid=0 gid=0 mode=0200100644: -rw-r--r--
  blocksize code=5 (32 subblocks)
  lastBlockSubblocks=0
  checksum=0xAD8E0B4B is Valid
  fileSize=3968 nFullBlocks=0
  currentMetadataReplicas=1 maxMetadataReplicas=2
  currentDataReplicas=1 maxDataReplicas=2
  ...
  Data [3968]:
0000000000000000: BCA91252 2B64BEDC A7D7BA9D D5BE8C30  *...R+d.........0*
...
0000000000000F70: DA925E2F 16A68C01 03CA5E37 08D72B7F  *..^/......^7..+.*
  trailer: is NULL


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