Evicting files or objects data

Complete the following steps to evict data from files or objects:

To create an AFM to cloud object storage relation, issue the following command:

mmafmcosconfig fs1 afmtocos1 --endpoint http://IP --uid 0 --gid 0 --new-bucket afmtocos1 --mode sw --object-fs --cleanup
afmobjfs=fs1 fileset=afmtocos1
bucket=afmtocos1 newbucket=afmtocos1 objectfs=yes dir=
policy= tmpdir= tmpfile= cleanup=yes mode=sw
xattr=no ssl=no acls=no gcs=no vhb=
bucketName=afmtocos1 serverName=IP
Linkpath=/gpfs/fs1/afmtocos1 target=http://IP/afmtocos1
endpoint=--endpoint http://IP
XOPT= -p afmObjectSubdir=yes -p afmParallelWriteChunkSize=0 -p afmParallelReadChunkSize=0
rc=0 mmdsh -vN c7f2n05 /usr/lpp/mmfs/bin/mmafmtransfer -v -t -a key -s key -b afmtocos1 -e http://IP bcreate

Create objects or files in the afmtocos1 fileset.

for a in `seq 10`; do dd if=/dev/urandom of=/gpfs/fs1/afmtocos1/object$a count=8 bs=256K & done

To get the contents of the fileset, issue the following command:

ls -lsh /gpfs/fs1/afmtocos1/

A sample output is as follows:

total 20M
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object1
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object10
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object2
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object3
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object4
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object5
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object6
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object7
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object8
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object9

Note: The space consumed is 20M, that is, each object is consuming 2 Mb.

To check the disk usage, issue the following command:
```
du -sh /gpfs/fs1/afmtocos1/
```
A sample output is as follows:
```
20M /gpfs/fs1/afmtocos1/
```

Evict an evict file that contains a list of files for the data eviction.

To get the list of files an evict file, issue the following command:

cat /root/evictfile

A sample output is as follows:

/gpfs/fs1/afmtocos1/object1
/gpfs/fs1/afmtocos1/object2
/gpfs/fs1/afmtocos1/object3
/gpfs/fs1/afmtocos1/object4
/gpfs/fs1/afmtocos1/object5

To evict files or objects, issue the following command:

mmafmcosctl fs1 afmtocos1 /gpfs/fs1/afmtocos1/ evict --object-list /root/evictfile

To check evicted data blocks and the disk size, issue the following command:

ls -lsh /gpfs/fs1/afmtocos1/

A sample output is as follows:

total 10M
0    -rw-r--r-- 1 root root 2.0M Sep 10 2020 object1
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object10
0    -rw-r--r-- 1 root root 2.0M Sep 10 2020 object2
0    -rw-r--r-- 1 root root 2.0M Sep 10 2020 object3
0    -rw-r--r-- 1 root root 2.0M Sep 10 2020 object4
0    -rw-r--r-- 1 root root 2.0M Sep 10 2020 object5
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object6
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object7
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object8
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object9

The ls command shows that evicted data blocks and the disk size is 0 for object1 through object5.

To check the disk usage, issue the following command:
```
du -sh /gpfs/fs1/afmtocos1/
```
A sample output is as follows:
```
10M /gpfs/fs1/afmtocos1/
```
Now the disk space is 10M because other 10M is evicted from five objects.

Bring back objects and files from a cloud object storage.

Issue to the following command:
```
cd /gpfs/fs1/afmtocos1/
```
To get the contents of the fileset, issue the following command:
```
cat object1 object2 object3 object4 object5 > /dev/null
```

To check the cache state, issue the following command:

mmafmctl  fs1 getstate

A sample output is as follows:

Fileset Name Fileset Target                   Cache State    Gateway Node  Queue Length Queue numExec
------------ -------------------------------- -------------  ------------  ------------ -------------
afmtocos1  http://IP:80/afmtocos1 Active        c7f2n05        0            36

To get the contents of the fileset, issue the following command:

ls -lsh /gpfs/fs1/afmtocos1/

A sample output is as follows:

total 20M
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object1
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object10
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object2
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object3
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object4
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object5
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object6
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object7
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object8
2.0M -rw-r--r-- 1 root root 2.0M Sep 10 2020 object9

To check the disk usage, issue the following command:
```
du -sh /gpfs/fs1/afmtocos1/
```
A sample output is as follows:
```
20M /gpfs/fs1/afmtocos1/
```

Now the used disk space is again 20Mb. This output shows that files are read and data is brought back from the cloud object storage.