question from a new cepher about bucket

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Hi friends:

 

I put a file(ceph_0.94.2-1.tar.gz, size 23812K) to ceph:

 

ceph@node110:~$ s3cmd ls

2015-08-27 06:13  s3://bkt-key

ceph@node110:~$ s3cmd put ceph_0.94.2-1.tar.gz s3://bkt-key

WARNING: Module python-magic is not available. Guessing MIME types based on file extensions.

ceph_0.94.2-1.tar.gz -> s3://bkt-key/ceph_0.94.2-1.tar.gz  [part 1 of 2, 15MB]

15728640 of 15728640   100% in    0s    26.21 MB/s  done

ceph_0.94.2-1.tar.gz -> s3://bkt-key/ceph_0.94.2-1.tar.gz  [part 2 of 2, 8MB]

8654277 of 8654277   100% in    0s    19.66 MB/s  done

 

ceph@node110:~$ rados ls -p .rgw.buckets.index

.dir.default.34155.1

 

ceph@node110:~$ rados ls -p .rgw.buckets

default.264124.1_ceph_0.94.2-1.tar.gz

default.264124.1__multipart_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.1

default.264124.1__shadow_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.1_1

default.264124.1__shadow_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.1_2

default.264124.1__shadow_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.1_3

default.264124.1__multipart_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.2

default.264124.1__shadow_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.2_1

default.264124.1__shadow_ceph_0.94.2-1.tar.gz.2~jwrAAAcyDV2WQ84lYvaoAa8l0V33hwb.2_2

 

the obj size of above order is: 0M4M4M4M3M4M4M26K, the total size is: 23812K equals with file ceph_0.94.2-1.tar.gz size

 

my question:

1、s3cmd put file per part is 15M, what is it limited its size, s3cmd or ceph?

2、The obj “default.264124.1_ceph_0.94.2-1.tar.gz” size if zero, what is the use of it?

3、obj’s name how to constitute? what means multipart an shadow? (bucket-id_mutipart/shadow_file-name.[hash?].num_num )

4、“.dir.default.34155.1” size is zero, is bucket index save as a object in rados? if it true which pool bucket index saved? how can I look it?

5who can give me some suggest about understand ceph, website, blog, book,video and so on? thanks!

 

thanks my friend…

 

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