Hey Bryan
There was a previous RFE for path placement from the UG, but Yuri
told me this was not techically possible as an inode has no knowledge
about the parent dentry. (IIRC). You can see this in effect in the C
API. It is possible to work this out at kernel level, but it's so
costly that it becomes non-viable at scale / performance.
IBMers please chip in and expand if you will.
Jez
On 31/10/16 17:09, Bryan Banister wrote:
The File Placement Policy that you are trying to set cannot use the
size of the file to determine the placement of the file in a GPFS
Storage Pool. This is because GPFS has no idea what the file size
will be when the file is open()’d for writing.
Hope that helps!
-Bryan
PS. I really wish that we could use a path for specifying data
placement in a GPFS Pool, and not just the file name, owner, etc.
I’ll submit a RFE for this.
*From:*gpfsug-discuss-boun...@spectrumscale.org
[mailto:gpfsug-discuss-boun...@spectrumscale.org] *On Behalf Of *J.
Eric Wonderley
*Sent:* Monday, October 31, 2016 11:53 AM
*To:* gpfsug main discussion list
*Subject:* [gpfsug-discuss] wanted...gpfs policy that places larger
files onto a pool based on size
I wanted to do something like this...
[root@cl001 ~]# cat /opt/gpfs/home.ply
/*Failsafe migration of old small files back to spinning media
pool(fc_8T) */
RULE 'theshold' MIGRATE FROM POOL 'system' THRESHOLD(90,70)
WEIGHT(ACCESS_TIME) TO POOL 'fc_8T'
/*Write files larger than 16MB to pool called "fc_8T" */
RULE 'bigfiles' SET POOL 'fc_8T' WHERE FILE_SIZE>16777216
/*Move anything else to system pool */
RULE 'default' SET POOL 'system'
Apparently there is no happiness using FILE_SIZE in a placement policy:
[root@cl001 ~]# mmchpolicy home /opt/gpfs/home.ply
Error while validating policy `home.ply': rc=22:
PCSQLERR: 'FILE_SIZE' is an unsupported or unknown attribute or
variable name in this context.
PCSQLCTX: at line 4 of 6: RULE 'bigfiles' SET POOL 'fc_8T' WHERE
{{{FILE_SIZE}}}>16777216
runRemoteCommand_v2: cl002.cl.arc.internal: tschpolicy /dev/home
/var/mmfs/tmp/tspolicyFile.mmchpolicy.113372 -t home.ply failed.
mmchpolicy: Command failed. Examine previous error messages to
determine cause.
Can anyone suggest a way to accomplish this using policy?
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