Using OS disk (SSD) as journal for OSD

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Hi,

 

I'm reading the documentation about creating new OSD's and I'm see:

 

"The foregoing example assumes a disk dedicated to one Ceph OSD Daemon, and a path to an SSD journal partition. We recommend storing the journal on a separate drive to maximize throughput. You may dedicate a single drive for the journal too (which may be expensive) or place the journal on the same disk as the OSD (not recommended as it impairs performance). In the foregoing example we store the journal on a partitioned solid state drive."

From: http://ceph.com/docs/master/rados/deployment/ceph-deploy-osd/

 

So I would like to create my journals on the same SSD as I have my OS (RAID1). Is this good practise to initiate a new disk with:

 

ceph-deploy disk zap osdserver1:sdb

ceph-deploy osd prepare osdserver1:sdb:/dev/sda

 

parted info on sda is:

 

Number  Start   End     Size    File system     Name     Flags

1      1049kB  211MB   210MB   ext4                     boot

2      211MB   21.2GB  21.0GB  ext4

3      21.2GB  29.6GB  8389MB  linux-swap(v1)

 

There is enough space for many 5G journal patitions on sda

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