Lsyncd Configuration Post: 303038591

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Top Forums UNIX for Beginners Questions & Answers Lsyncd Configuration Post 303038591 by stomp on Friday 6th of September 2019 04:54:45 PM

09-06-2019

Registered User

I used lsyncd to migrate(p2v) servers to minimize downtime when migrating. Had lot's of files(1K-1M).

Like plain rsync it's good for a lot of things. It's very bad for syncing big files which change often(-> big database files), because lsyncd will constantly syncing those big files if only one byte changes. ( I had ~100 smaller mysql databases on some server. This worked fine.)

Worked like charm. You can apply rsync args with rsync/_extra:

Code:

sync {
    default.rsync,
    source    = "/",
    target    = "1.2.3.42:/disk/",
    exclude   = {
                "/proc/**",
                "/sys/**",
                "/dev/**"
                },
    rsync     = {
        archive  = true,
        _extra  = { "-v", "-H", "--numeric-ids" }
    }
}

Update:
Since you copy files from nfs to nfs I recommend to check disabling the Delta-Transfer with -W.

If not lsyncd/rsync will read the whole file from the source-nfs before transferring the 5 (Bytes? MBytes? GBytes?) that have changed.

The above is default, when - like in this case - both source and target path are local(begin with /).

If you have so many files and access it via nfs the initial phase is of course taking long. (I had backup issues of servers with 4-8 million files, took 10-30 hours for an rsync backup to take place even if little changed - and that was with a local source). This should be either with lsyncd or rsync. But I'm curious if plain rsync is faster.

If you just have vanishing many files, this should not cause heavy load.

I think there's not so much difference between lsyncd and rsync. Because the former is just like a wrapper of the latter.

Last edited by stomp; 09-07-2019 at 09:09 AM..

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AuMakeElementImportBucket(3) Library Functions Manual AuMakeElementImportBucket(3)

Name
AuMakeElementImportBucket - initialize an ImportBucket element

Synopsis
#include <audio/audiolib.h>

AuMakeElementImportBucket(element, sample_rate, bucket, num_samples, offset, num_actions, actions)
AuElement *element; /* RETURN */
unsigned short sample_rate;
AuBucketID bucket;
AuUint32 num_samples;
AuInt32 offset;
int num_actions;
AuElementAction *actions;

Arguments
element Returns the initialized element.

sample_rate
Specifies the sample rate of the audio data.

bucket Specifies the ID of the bucket to read the audio data from.

num_samples
Specifies the number of samples to read from the bucket. Ignored for "trivial" flows.

offset Specifies the offset into the bucket to begin reading at.

num_actions
Specifies the number of actions in actions.

actions Specifies the list of actions to associate with this element. Entries in this list can be initialized with AuMakeChangeStateAc-
tion, AuMakeSendNotifyAction, and AuMakeNoopAction. May be NULL.

Description
AuMakeElementImportBucket sets the type member of element to AuElementTypeImportBucket and initializes the importbucket member of element
with the remaining arguments.

AuMakeElementImportBucket is implemented as a macro.

See Also
AuMakeElementAddConstant, AuMakeElementBundle, AuMakeElementExportBucket, AuMakeElementExportClient, AuMakeElementExportDevice, AuMakeEle-
mentExportMonitor, AuMakeElementImportClient, AuMakeElementImportDevice, AuMakeElementImportWaveForm, AuMakeElementMultiplyConstant, AuMa-
keElementSum.

audiolib - Network Audio System C Language Interface

audiolib - element initialization 1.9.3 AuMakeElementImportBucket(3)

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