zvol_wait logic may terminate prematurely #13998
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Setups that have a lot of zvols may see zvol_wait terminate prematurely even though the script is still making progress. For example, we have a customer that called zvol_wait for ~7100 zvols and by the last iteration of that script it was still waiting on ~2900. Similarly another one called zvol_wait for 2200 and by the time the script terminated there were only 50 left. This patch adjusts the logic to stay within the outer loop of the script if we are making any progress whatsoever. Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
behlendorf
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Oct 7, 2022
don-brady
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Oct 10, 2022
sdimitro
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Status: Accepted
grwilson
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Oct 11, 2022
andrewc12
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Oct 12, 2022
Setups that have a lot of zvols may see zvol_wait terminate prematurely even though the script is still making progress. For example, we have a customer that called zvol_wait for ~7100 zvols and by the last iteration of that script it was still waiting on ~2900. Similarly another one called zvol_wait for 2200 and by the time the script terminated there were only 50 left. This patch adjusts the logic to stay within the outer loop of the script if we are making any progress whatsoever. Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Don Brady <don.brady@delphix.com> Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com> Closes openzfs#13998
behlendorf
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that referenced
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Nov 1, 2022
Setups that have a lot of zvols may see zvol_wait terminate prematurely even though the script is still making progress. For example, we have a customer that called zvol_wait for ~7100 zvols and by the last iteration of that script it was still waiting on ~2900. Similarly another one called zvol_wait for 2200 and by the time the script terminated there were only 50 left. This patch adjusts the logic to stay within the outer loop of the script if we are making any progress whatsoever. Reviewed-by: George Wilson <gwilson@delphix.com> Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com> Reviewed-by: Don Brady <don.brady@delphix.com> Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com> Closes #13998
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Setups that have a lot of zvols may see zvol_wait terminate prematurely even though the script is still making progress. For example, we have a customer that called zvol_wait for ~7100 zvols and by the last iteration of that script it was still waiting on ~2900. Similarly another one called zvol_wait for 2200 and by the time the script terminated there were only 50 left.
This patch adjusts the logic to stay within the outer loop of the script if we are making any progress whatsoever.
Signed-off-by: Serapheim Dimitropoulos serapheim@delphix.com
Testing
With @don-brady 's help I managed to reproduce the issue by invoking a 20-second sleep in the udev-rule that creates those links. Here is the rule with the sleep statemet:
And here is the reproduced error as seen by
journalctl:With this patch I verified that the service stays around and eventually finishes successfully.