Bug 1619839

Summary: ceph-iscsi: fix perf issues with xcopy
Product: [Red Hat Storage] Red Hat Ceph Storage Reporter: Mike Christie <mchristi>
Component: iSCSIAssignee: Mike Christie <mchristi>
Status: CLOSED ERRATA QA Contact: Madhavi Kasturi <mkasturi>
Severity: medium Docs Contact:
Priority: low    
Version: 3.2CC: ceph-eng-bugs, ceph-qe-bugs, hnallurv, jdillama, mchristi
Target Milestone: rc   
Target Release: 3.2   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: tcmu-runner-1.4.0-1.el7cp Doc Type: If docs needed, set a value
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Last Closed: 2019-01-03 19:01:46 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Mike Christie 2018-08-21 21:22:29 UTC 
Description of problem:

The tcmu-runner xcopy support does at most 1 512K IO at a time. It reads 512K, then writes it, then repeats.

Ideally, for rbd we should add offload support similar to what was done for write same and compare and write.

In the near term and to if needed to handle xcopys that do not cover entire ceph objects, we should fix the emulated xcopy support to work like the emulated unmap where we can break up a unmap into multiple parts that at executed in parallel.


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Comment 3 Harish NV Rao 2018-08-23 05:55:29 UTC 
@Mike, will this be fixed in 3.2? if yes then please change the target release field.
Comment 10 errata-xmlrpc 2019-01-03 19:01:46 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2019:0020