Earlier, the rebalance process used fallocate() system call to create the destination files when migrating sparse files. This sometimes resulted in the error “No space left on the device” if the size of the sparse file was enormous and the destination node could not accommodate the file.
With this update, the code is modified to use truncate() system call to create destination files, and now rebalance no longer fails the migration of sparse files even with enormous size.
Description of problem:
-----------------------
On a volume, there are files with holes present. Added bricks to the volume and triggered rebalance. But there are failures in rebalance due to [No space left on device] error, even though the destination brick has enough space.
Version-Release number of selected component (if applicable):
-------------------------------------------------------------
RHEL info : RHEL 8.2
RHGS build info : 6.0.32
How reproducible:
-----------------
Always
Steps to Reproduce:
------------------
1.Create a 1X3 volume.
2.Mount the volume using FUSE.
3.On the volume root, create files using:
# for i in {1..5000}; do dd if=/dev/urandom of=file_with_holes$i bs=1M count=1 seek=100M; done
4.After the file creation is complete, add bricks to the volume.
5.Trigger rebalance.
6.Wait for rebalance to complete.
Actual results:
---------------
Failures in rebalance due to [No space left on device] error.
Expected results:
----------------
Rebalance should complete successfully as there is enough space on destination brick.
Additional info:
----------------
sos-reports will be shared.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:2572
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:2572
Description of problem: ----------------------- On a volume, there are files with holes present. Added bricks to the volume and triggered rebalance. But there are failures in rebalance due to [No space left on device] error, even though the destination brick has enough space. Version-Release number of selected component (if applicable): ------------------------------------------------------------- RHEL info : RHEL 8.2 RHGS build info : 6.0.32 How reproducible: ----------------- Always Steps to Reproduce: ------------------ 1.Create a 1X3 volume. 2.Mount the volume using FUSE. 3.On the volume root, create files using: # for i in {1..5000}; do dd if=/dev/urandom of=file_with_holes$i bs=1M count=1 seek=100M; done 4.After the file creation is complete, add bricks to the volume. 5.Trigger rebalance. 6.Wait for rebalance to complete. Actual results: --------------- Failures in rebalance due to [No space left on device] error. Expected results: ---------------- Rebalance should complete successfully as there is enough space on destination brick. Additional info: ---------------- sos-reports will be shared.