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Status Not under consideration
Created by Guest
Created on Jul 30, 2014

[BDA] Ability to see what is in the cache

Use:  mmlscache gives containing directory, file, size/blocks, % used of cache, cache hits, last access time etc.  -Y option

Idea priority High
  • Guest
    Reply
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    Sep 30, 2020

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - IBM Spectrum Scale
    Product - Spectrum Scale (formerly known as GPFS) - Private RFEs
    Component - Product functionality

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - IBM Spectrum Scale
    Product - Spectrum Scale (formerly known as GPFS) - Private RFEs
    Component - V3 Product functionality

  • Guest
    Reply
    |
    Jun 4, 2020

    Partially addressed in 5.0.1 with mmcachectl. No further work is planned at this time

  • Guest
    Reply
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    Nov 12, 2016

    This RFE's Headline was changed after submission to reflect the headline of an internal request we were already considering, but will now track here.

  • Guest
    Reply
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    Mar 23, 2016

    it's in our to-do list. we will re-consider the design and give scheduler later.

  • Guest
    Reply
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    Oct 21, 2014

    The basic need to be able to tell what is in cache is of course reasonable. The details can get complicated though. First of all, there are several types of caches. Among most important are: GPFS pagepool, GPFS OpeFile and CompactOpenFile cache objects, GPFS token objects, Linux kernel inode and dentry objects. It would be technically difficult to display all object types on a live system (i.e. with the cache content being fluid), and the utility of this is unclear. This item will be used for the specific task of displaying GPFS pagepool content. It should be noted that the amount of information available about pagepool objects is limited. Most importantly, there's no cheap way to generate a pathname for each inode number (one could use tsfindinode to do the conversion, the cost of which may be non-trivial on a large file system). Some objects, e.g. mid-level indirect blocks, won't have an easy-to-understand label. GPFS doesn't keep "last accessed" information for all objects. So some form of pagepool content display command is possible, but it can not be implemented exactly as requested.

  • Guest
    Reply
    |
    Sep 19, 2014

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - General Parallel File System
    Product - GPFS
    Component - V3 Product functionality
    Operating system - Multiple

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - General Parallel File System
    Product - GPFS
    Component - V3
    Operating system - Multiple

  • Guest
    Reply
    |
    Jul 31, 2014

    Creating a new RFE based on Community RFE #56766 in product GPFS.