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Status Future consideration
Workspace Storage Protect Family
Categories Spectrum Protect (Server)
Created by Guest
Created on Feb 4, 2022

RELATED IDEAS

Improve disk to tape data migration by allowing multiple threads to read data from disk in parallel

Spectrum Protect (SP) server data migration performance from disk to tape is limited by the data throughput reading data from disk.
In this situation the SP server was reading data from disk (flash) with about 90MB/sec.
The SP server internal instrumentation showed, that writing the data out to a single tape drive could achieve about 300MB/sec or more.
Because the SP server was reading data from disk with a single thread only, data migration from disk to tape was limited by disk read throughput to about 90MB/sec.
We are requesting to implement multi thread disk reads allowing the SP server to use multiple threads to read data from disk in parallel.
The data read from disk using multiple disk read threads then must be multiplexed into a single data stream to a tape drive.
Example:
3 SP server threads read data from disk with 90MB/sec throughput for each disk read thread. This will result in about 270MB/sec combined read throughput.
All data coming from the 3 disk read threads should be written out to a single tape drive, which in the best case will result in 270MB/sec system performance as the tape drive can write up to 300MB/sec.

Idea priority Urgent
  • Guest
    Reply
    |     Apr 1, 2022

    Use FILE pools instead of DISK pools, the latter have lots of performance bottlenecks. Given reasonably sized files we have no problem migrating 360 MB/s (full drive speed) from spinning disk to tape.


    For lots of small files, you might also hit bottlenecks in your DB storage setup. The same is true if you've fallen for the dedup hype (where you're always working on small files due to chunking).


  • Guest
    Reply
    |     Feb 25, 2022

    This request may not be delivered within the release currently under development, but the theme is aligned with the current multi-year strategy. IBM may consider and evaluate any RFE Community feedback for this request through activities such as voting. IBM will update this request in the future.

  • Guest
    Reply
    |     Feb 7, 2022

    Hello,
    True but move data doesn't works volumes in cold cache storage pool.

    Regards,
    Jakub

  • Guest
    Reply
    |     Feb 5, 2022

    hi
    this is interesting
    multiplexing has always been an issue with ibm spectrum protect/tsm/adsm
    The migrations process only manage one volume at a time, but as tape media is faster than disk media for sequential read and write, it is difficult to utilize the performance of a tape drive, unless multiplexing is introduced

    I remember that we had to run “move volume” instead of plain migration as it was faster
    and in that way migrate data faster from a file storage pool to tape

    not sure what storage pool you are using?

    regards Tomas
    @spictera - innovative agentless data protection for spectrum protect

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