Cephfs and ERESTARTSYS on writes

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Hello,

I'm having an issue with nginx writing to cephfs. Often I'm getting:

writev() "/home/ceph/temp/44/94/1/0000119444" failed (4: Interrupted
system call) while reading upstream

looking with strace, this happens:

...
write(65, "e\314\366\36\302"..., 65536) = ? ERESTARTSYS (To be restarted)

It happens after first 4MBs (exactly) are written, subsequent write gets
ERESTARTSYS (sometimes, but more rarely, it fails after first 32 or
64MBs, etc are written). Apparently nginx doesn't expect this and
doesn't handle it so it cancels writes and deletes this partial file.

Is it possible Ceph cannot find the destination PG fast enough and
returns ERESTARTSYS? Is there any way to fix this behavior or reduce it?

Regards,
Vedran



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