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Ceph large file transfer failures

asked 2021-06-07 17:11:41 +0300

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We are using Ceph for windows in conjunction with Dokan to transfer files from windows machines to a very large (multi PB) Ceph cluster running on Linux. The drive mounts correctly and small files (e.g. a few MB) transfer without issue. When we try to send either a large file (e.g. 10 GB) or many small files at once (e.g. 1000 x 1MB) the transfer fails. Are there some logs that we can look at to see why there are failure?

The only thing I have to go on is a post transfer attempt failure message from windows that reports "Error 0x800705AA: insufficient system resources" yet task manager shows the resources as available. Online recommendations are to do a sfc/scannow but this is a clean install of Windows.

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answered 2021-06-08 09:43:40 +0300

lpetrut gravatar image


Can you please send us the Ceph version (ceph-dokan -v)?

ceph-dokan can log to stderr, event log and/or a log file, here's a config sample: As shown there, raising the cephfs client log level to 3 might include some useful information.

Let's see if it's a Ceph error. If not, we can retrieve Dokany logs from stderr using the --debug --dokan-stderr arguments.

By the way, how reproducible is it?

Thanks, Lucian

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Asked: 2021-06-07 17:11:41 +0300

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Last updated: Jun 08