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8.3 KiB
Markdown
298 lines
8.3 KiB
Markdown
---
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title: "B2"
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description: "Backblaze B2"
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date: "2016-10-25"
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---
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<i class="fa fa-fire"></i>Backblaze B2
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----------------------------------------
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B2 is [Backblaze's cloud storage system](https://www.backblaze.com/b2/).
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Paths are specified as `remote:bucket` (or `remote:` for the `lsd`
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command.) You may put subdirectories in too, eg `remote:bucket/path/to/dir`.
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Here is an example of making a b2 configuration. First run
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rclone config
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This will guide you through an interactive setup process. You will
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need your account number (a short hex number) and key (a long hex
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number) which you can get from the b2 control panel.
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```
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No remotes found - make a new one
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n) New remote
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q) Quit config
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n/q> n
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name> remote
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Type of storage to configure.
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Choose a number from below, or type in your own value
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1 / Amazon Drive
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\ "amazon cloud drive"
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2 / Amazon S3 (also Dreamhost, Ceph, Minio)
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\ "s3"
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3 / Backblaze B2
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\ "b2"
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4 / Dropbox
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\ "dropbox"
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5 / Encrypt/Decrypt a remote
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\ "crypt"
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6 / Google Cloud Storage (this is not Google Drive)
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\ "google cloud storage"
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7 / Google Drive
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\ "drive"
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8 / Hubic
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\ "hubic"
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9 / Local Disk
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\ "local"
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10 / Microsoft OneDrive
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\ "onedrive"
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11 / Openstack Swift (Rackspace Cloud Files, Memset Memstore, OVH)
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\ "swift"
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12 / Yandex Disk
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\ "yandex"
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Storage> 3
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Account ID
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account> 123456789abc
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Application Key
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key> 0123456789abcdef0123456789abcdef0123456789
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Endpoint for the service - leave blank normally.
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endpoint>
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Remote config
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--------------------
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[remote]
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account = 123456789abc
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key = 0123456789abcdef0123456789abcdef0123456789
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endpoint =
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--------------------
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y) Yes this is OK
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e) Edit this remote
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d) Delete this remote
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y/e/d> y
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```
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This remote is called `remote` and can now be used like this
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See all buckets
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rclone lsd remote:
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Make a new bucket
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rclone mkdir remote:bucket
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List the contents of a bucket
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rclone ls remote:bucket
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Sync `/home/local/directory` to the remote bucket, deleting any
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excess files in the bucket.
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rclone sync /home/local/directory remote:bucket
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### Modified time ###
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The modified time is stored as metadata on the object as
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`X-Bz-Info-src_last_modified_millis` as milliseconds since 1970-01-01
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in the Backblaze standard. Other tools should be able to use this as
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a modified time.
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Modified times are used in syncing and are fully supported except in
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the case of updating a modification time on an existing object. In
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this case the object will be uploaded again as B2 doesn't have an API
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method to set the modification time independent of doing an upload.
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### SHA1 checksums ###
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The SHA1 checksums of the files are checked on upload and download and
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will be used in the syncing process.
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Large files which are uploaded in chunks will store their SHA1 on the
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object as `X-Bz-Info-large_file_sha1` as recommended by Backblaze.
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### Transfers ###
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Backblaze recommends that you do lots of transfers simultaneously for
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maximum speed. In tests from my SSD equiped laptop the optimum
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setting is about `--transfers 32` though higher numbers may be used
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for a slight speed improvement. The optimum number for you may vary
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depending on your hardware, how big the files are, how much you want
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to load your computer, etc. The default of `--transfers 4` is
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definitely too low for Backblaze B2 though.
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Note that uploading big files (bigger than 200 MB by default) will use
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a 96 MB RAM buffer by default. There can be at most `--transfers` of
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these in use at any moment, so this sets the upper limit on the memory
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used.
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### Versions ###
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When rclone uploads a new version of a file it creates a [new version
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of it](https://www.backblaze.com/b2/docs/file_versions.html).
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Likewise when you delete a file, the old version will still be
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available.
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Old versions of files are visible using the `--b2-versions` flag.
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If you wish to remove all the old versions then you can use the
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`rclone cleanup remote:bucket` command which will delete all the old
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versions of files, leaving the current ones intact. You can also
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supply a path and only old versions under that path will be deleted,
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eg `rclone cleanup remote:bucket/path/to/stuff`.
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When you `purge` a bucket, the current and the old versions will be
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deleted then the bucket will be deleted.
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However `delete` will cause the current versions of the files to
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become hidden old versions.
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Here is a session showing the listing and and retreival of an old
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version followed by a `cleanup` of the old versions.
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Show current version and all the versions with `--b2-versions` flag.
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```
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$ rclone -q ls b2:cleanup-test
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9 one.txt
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$ rclone -q --b2-versions ls b2:cleanup-test
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9 one.txt
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8 one-v2016-07-04-141032-000.txt
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16 one-v2016-07-04-141003-000.txt
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15 one-v2016-07-02-155621-000.txt
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```
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Retreive an old verson
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```
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$ rclone -q --b2-versions copy b2:cleanup-test/one-v2016-07-04-141003-000.txt /tmp
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$ ls -l /tmp/one-v2016-07-04-141003-000.txt
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-rw-rw-r-- 1 ncw ncw 16 Jul 2 17:46 /tmp/one-v2016-07-04-141003-000.txt
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```
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Clean up all the old versions and show that they've gone.
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```
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$ rclone -q cleanup b2:cleanup-test
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$ rclone -q ls b2:cleanup-test
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9 one.txt
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$ rclone -q --b2-versions ls b2:cleanup-test
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9 one.txt
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```
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### Data usage ###
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It is useful to know how many requests are sent to the server in different scenarios.
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All copy commands send the following 4 requests:
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```
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/b2api/v1/b2_authorize_account
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/b2api/v1/b2_create_bucket
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/b2api/v1/b2_list_buckets
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/b2api/v1/b2_list_file_names
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```
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The `b2_list_file_names` request will be sent once for every 1k files
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in the remote path, providing the checksum and modification time of
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the listed files. As of version 1.33 issue
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[#818](https://github.com/ncw/rclone/issues/818) causes extra requests
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to be sent when using B2 with Crypt. When a copy operation does not
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require any files to be uploaded, no more requests will be sent.
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Uploading files that do not require chunking, will send 2 requests per
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file upload:
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```
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/b2api/v1/b2_get_upload_url
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/b2api/v1/b2_upload_file/
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```
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Uploading files requiring chunking, will send 2 requests (one each to
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start and finish the upload) and another 2 requests for each chunk:
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```
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/b2api/v1/b2_start_large_file
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/b2api/v1/b2_get_upload_part_url
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/b2api/v1/b2_upload_part/
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/b2api/v1/b2_finish_large_file
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```
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### B2 with crypt ###
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When using B2 with `crypt` files are encrypted into a temporary
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location and streamed from there. This is required to calculate the
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encrypted file's checksum before beginning the upload. On Windows the
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%TMPDIR% environment variable is used as the temporary location. If
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the file requires chunking, both the chunking and encryption will take
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place in memory.
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### Specific options ###
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Here are the command line options specific to this cloud storage
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system.
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#### --b2-chunk-size valuee=SIZE ####
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When uploading large files chunk the file into this size. Note that
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these chunks are buffered in memory and there might a maximum of
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`--transfers` chunks in progress at once. 100,000,000 Bytes is the
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minimim size (default 96M).
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#### --b2-upload-cutoff=SIZE ####
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Cutoff for switching to chunked upload (default 190.735 MiB == 200
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MB). Files above this size will be uploaded in chunks of
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`--b2-chunk-size`.
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This value should be set no larger than 4.657GiB (== 5GB) as this is
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the largest file size that can be uploaded.
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#### --b2-test-mode=FLAG ####
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This is for debugging purposes only.
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Setting FLAG to one of the strings below will cause b2 to return
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specific errors for debugging purposes.
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* `fail_some_uploads`
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* `expire_some_account_authorization_tokens`
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* `force_cap_exceeded`
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These will be set in the `X-Bz-Test-Mode` header which is documented
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in the [b2 integrations
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checklist](https://www.backblaze.com/b2/docs/integration_checklist.html).
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#### --b2-versions ####
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When set rclone will show and act on older versions of files. For example
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Listing without `--b2-versions`
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```
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$ rclone -q ls b2:cleanup-test
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9 one.txt
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```
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And with
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```
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$ rclone -q --b2-versions ls b2:cleanup-test
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9 one.txt
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8 one-v2016-07-04-141032-000.txt
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16 one-v2016-07-04-141003-000.txt
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15 one-v2016-07-02-155621-000.txt
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```
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Showing that the current version is unchanged but older versions can
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be seen. These have the UTC date that they were uploaded to the
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server to the nearest millisecond appended to them.
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Note that when using `--b2-versions` no file write operations are
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permitted, so you can't upload files or delete them.
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