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Re: [Drbd-dev] [PATCH 04/30] drbd: Implement handling of thinly provisioned storage on resync target nodes

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Am Montag, 25. April 2016, 08:28:45 schrieb Bart Van Assche:
> On 04/25/2016 05:10 AM, Philipp Reisner wrote:
> > If during resync we read only zeroes for a range of sectors assume
> > that these secotors can be discarded on the sync target node.
> 
> Hello Phil,
> 
> With which interconnect(s) has this patch been tested? I'm afraid that
> for high-speed interconnects this patch will slow down I/O instead of
> making it faster because all_zero() examines all data before it is sent.
> 

Hi Bart,

that it might make things slower is true for sure. The benefit it
provides is to de-allocate blocks on the secondary obviously.
The whole feature is optional and it is off by default.

Obviously we want to have a generic interface like SEEK_HOLE/
SEEK_DATA for block devices, but that does not exist as of today.

best regards,
 Phil

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Thread

[PATCH 00/30] DBRD updates Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 04/30] drbd: Implement handling of thinly provisioned storage on resync target nodes Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
    Re: [Drbd-dev] [PATCH 04/30] drbd: Implement handling of thinly provisioned storage on resync target nodes Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 18:50 +0200
  [PATCH 15/30] drbd: finish resync on sync source only by notification from sync target Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 17/30] drbd: don't forget error completion when "unsuspending" IO Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 05/30] drbd: Introduce new disk config option rs-discard-granularity Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
    Re: [Drbd-dev] [PATCH 05/30] drbd: Introduce new disk config option rs-discard-granularity Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 18:50 +0200
      Re: [Drbd-dev] [PATCH 05/30] drbd: Introduce new disk config option rs-discard-granularity Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 21:50 +0200
        [PATCH 05/30] drbd: Introduce new disk config option  rs-discard-granularity Lars Ellenberg <lars.ellenberg@linbit.com> - 2016-04-25 22:40 +0200
  [PATCH 28/30] drbd: finally report ms, not jiffies, in log message Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 11/30] drbd: when receiving P_TRIM, zero-out partial unaligned chunks Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
    [PATCH 11/30] drbd: when receiving P_TRIM, zero-out partial  unaligned chunks Lars Ellenberg <lars.ellenberg@linbit.com> - 2016-04-25 22:40 +0200
      Re: [PATCH 11/30] drbd: when receiving P_TRIM, zero-out partial  unaligned chunks Lars Ellenberg <lars.ellenberg@linbit.com> - 2016-04-25 23:30 +0200
  [PATCH 24/30] drbd: disallow promotion during resync handshake, avoid deadlock and hard reset Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 29/30] drbd: al_write_transaction: skip re-scanning of bitmap page pointer array Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200
  [PATCH 10/30] drbd: allow parallel flushes for multi-volume resources Philipp Reisner <philipp.reisner@linbit.com> - 2016-04-25 14:30 +0200

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