If all the system disk does is handle the o/s (ie osd journals are on
dedicated or osd drives as well), no problem. Just rebuild the system
and copy the ceph.conf back in when you re-install ceph. Keep a spare
copy of your original fstab to keep your osd filesystem mounts straight.
Just keep in mind that you are down 11 osds while that system drive gets
rebuilt though. It's safer to do 10 osds and then have a mirror set for
the system disk.
Bill Sharer
On 08/12/2016 03:33 PM, Ronny Aasen wrote:
On 12.08.2016 13:41, Félix Barbeira wrote:
Hi,
I'm planning to make a ceph cluster but I have a serious doubt. At
this moment we have ~10 servers DELL R730xd with 12x4TB SATA disks.
The official ceph docs says:
"We recommend using a dedicated drive for the operating system and
software, and one drive for each Ceph OSD Daemon you run on the host."
I could use for example 1 disk for the OS and 11 for OSD data. In the
operating system I would run 11 daemons to control the OSDs.
But...what happen to the cluster if the disk with the OS fails??
maybe the cluster thinks that 11 OSD failed and try to replicate all
that data over the cluster...that sounds no good.
Should I use 2 disks for the OS making a RAID1? in this case I'm
"wasting" 8TB only for ~10GB that the OS needs.
In all the docs that i've been reading says ceph has no unique single
point of failure, so I think that this scenario must have a optimal
solution, maybe somebody could help me.
Thanks in advance.
--
Félix Barbeira.
if you do not have dedicated slots on the back for OS disks, then i
would recomend using SATADOM flash modules directly into a SATA port
internal in the machine. Saves you 2 slots for osd's and they are
quite reliable. you could even use 2 sd cards if your machine have the
internal SD slot
http://www.dell.com/downloads/global/products/pedge/en/poweredge-idsdm-whitepaper-en.pdf
kind regards
Ronny Aasen
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