Hi everyone,
I started to take a look at xrootd ceph plugin with version
4.10.1, since I'd like to understand if we can use ceph rbd as
backend for an xcache instance.
So, first of all, is it supported?
With a blind shot I tried using a basic local setup and the cache
configuration here(*). With a xrdcp I do not get errore, but the
cache is not creating the file in the pool, with this error (**).
Shooting in the dark again, I would say that this is related to
this (***).
This is everything I have so far, can you help me understanding if it is possible? And in case no, do you have any suggested solution here?
Thanks,
Diego
(*)
xrootd.trace all
ofs.trace dump
xrd.trace debug
cms.trace debug
sec.trace debug
pfc.trace dump
oss.trace dump
all.export /
all.role server
xrd.port 32294
ofs.osslib libXrdPss.so
pss.cachelib libXrdFileCache.so
pfc.osslib /lib64/libXrdCeph.so diego@diegopool
pss.origin localhost:1094
pfc.diskusage 0.8 0.9
pfc.ram 1g
pfc.blocksize 512k
pfc.prefetch 0
(**)
191030 09:49:26 236384 root.236560:34@localhost XrootdProtocol:
0100 open rat /test.txt?
ceph_stat: /test.txt.cinfo
191030 09:49:26 236384 XrdFileCache_Manager: info Cache::Attach()
root://u34@localhost:1094//test.txt?pss.tid=root.236560:34@localhost&oss.lcl=1
191030 09:49:26 236384 XrdFileCache_Manager: debug Cache::GetFile
/test.txt, io 0x7f22b0003960
ceph_stat: /test.txt.cinfo
191030 09:49:26 236384 XrdFileCache_IO: debug
IOEntireFile::initCachedStat get stat from client res = 0, size =
10 root://u34@localhost:1094//test.txt?p
ss.tid=root.236560:34@localhost&oss.lcl=1
191030 09:49:26 236384 XrdFileCache_File: dump File::Open() open
file for disk cache /test.txt
ceph_stat: /test.txt
ceph_stat: /test.txt.cinfo
191030 09:49:26 236384 XrdFileCache_File: error File::Open()
Create failed , err_code=95, err_str=Operation not supported
/test.txt
191030 09:49:26 236384 XrdFileCache_File: debug File::~File()
ended, prefetch score = 1 /test.txt
191030 09:49:26 236384 XrdFileCache_IO: debug
IOEntireFile::~IOEntireFile() 0x7f22b0003960
root://u34@localhost:1094//test.txt?pss.tid=root.236560:34@lo
calhost&oss.lcl=1
191030 09:49:26 236384 XrdFileCache_Manager: error Cache::Attach()
Failed opening local file, falling back to remote access
root://u34@localhost:1094//t
est.txt?pss.tid=root.236560:34@localhost&oss.lcl=1
(***)
https://github.com/xrootd/xrootd-ceph/blob/master/src/XrdCeph/XrdCephOss.cc#L166
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