Oops, forgot a step - need to tell the MDS about the new pool before step 2:
`ceph mds add_data_pool <name>`
You may also need to mark the pool as used by cephfs:
`ceph osd pool application enable {pool-name} cephfs`
On Wed, May 15, 2019 at 3:15 PM Elise Burke <[email protected]> wrote:
> I came across that and tried it - the short answer is no, you can't do
> that - using cache tier. The longer answer as to why I'm less sure about,
> but iirc it has to do with copying / editing the OMAP object properties.
>
> The good news, however, is that you can 'fake it' using File Layouts -
> http://docs.ceph.com/docs/mimic/cephfs/file-layouts/
>
> In my case I was moving around / upgrading disks and wanted to change from
> unreplicated (well, r=1) to erasure coding (in my case, rs4.1). I was able
> to do this keeping the following in mind:
>
> 1. The original pool, cephfs_data, must remain as a replicated pool. I'm
> unsure why, IIRC some metadata can't be kept in erasure coded pools.
> 2. The metadata pool, cephfs_metadata, must also remain as a replicated
> pool.
> 3. Your new pool (the destination pool) can be created however you like.
> 4. This procedure involves rolling unavailability on a per-file basis.
>
> This is from memory; I should do a better writeup elsewhere, but what I
> did was this:
>
> 1. Create your new pool. `ceph osd pool create cephfs_data_ec_rs4.1 8 8
> erasure rs4.1`
> 2. Set the xattr for the root directory to use the new pool: `setfattr -n
> ceph.file.layout.pool -v cephfs_data_ec_rs4.1 /cephfs_mountpoint/`
>
> At this stage all new files will be written to the new pool. Unfortunately
> you can't change the layout of a file with data, so copying the files back
> into their own place is required. You can hack up a bash script to do this,
> or write a converter program. Here's the most relevant bit, per file, which
> copies the file first and then renames the new file to the old file:
>
> func doConvert(filename string) error {
> poolRewriteName, previousPoolName, err :=
> newNearbyTempFiles(filename)
> if err != nil {
> return err
> }
> err = SetCephFSFileLayoutPool(poolRewriteName, []byte(*toPool))
> if err != nil {
> os.Remove(poolRewriteName)
> os.Remove(previousPoolName)
> return err
> }
>
> err = CopyFilePermissions(filename, poolRewriteName)
> if err != nil {
> os.Remove(poolRewriteName)
> os.Remove(previousPoolName)
> return err
> }
>
> //log.Printf("Copying %s to %s\n", filename, poolRewriteName)
> err = CopyFile(filename, poolRewriteName)
> if err != nil {
> os.Remove(poolRewriteName)
> os.Remove(previousPoolName)
> return err
> }
>
> //log.Printf("Moving %s to %s\n", filename, previousPoolName)
> err = MoveFile(filename, previousPoolName)
> if err != nil {
> os.Remove(poolRewriteName)
> os.Remove(previousPoolName)
> return err
> }
>
> //log.Printf("Moving %s to %s\n", poolRewriteName, filename)
> err = MoveFile(poolRewriteName, filename)
> os.Remove(poolRewriteName)
> os.Remove(previousPoolName)
> return err
> }
>
>
>
> On Wed, May 15, 2019 at 10:31 AM Lars Täuber <[email protected]> wrote:
>
>> Hi,
>>
>> is there a way to migrate a cephfs to a new data pool like it is for rbd
>> on nautilus?
>> https://ceph.com/geen-categorie/ceph-pool-migration/
>>
>> Thanks
>> Lars
>> _______________________________________________
>> ceph-users mailing list
>> [email protected]
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>>
>
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