Hi David,
Thank you for your response.
Failure domain for ec profile is 'host'. So I guess it is okay to add a node and activate 5 disks at a time ?
$ ceph osd erasure-code-profile get profile5by3
crush-device-class=
crush-failure-domain=host
crush-root=default
jerasure-per-chunk-alignment=false
k=5
m=3
plugin=jerasure
technique=reed_sol_van
w=8
Karun Josy
On Sun, Dec 17, 2017 at 11:26 PM, David Turner <drakonstein@xxxxxxxxx> wrote:
I like to avoid adding disks from more than 1 failure domain at a time in case some of the new disks are bad. In your example of only adding 1 new node, I would say that adding all of the disks at the same time is the better way to do it.
Adding only 1 disk in the new node at a time would actually be worse for the balance of the cluster as it would only have 1 disk while the rest have all 5 or more.
The EC profile shouldn't play into account as you already have enough hosts to fulfill it.
On Sun, Dec 17, 2017, 11:57 AM Karun Josy <karunjosy1@xxxxxxxxx> wrote:______________________________Hi,We have a live cluster with 8 OSD nodes all having 5-6 disks each.We would like to add a new host and expand the cluster.We have 4 pools- 3 replicated pools with replication factor 5 and 3- 1 erasure coded pool with k=5, m=3So my concern is, is there any precautions that are needed to add the new host since the ec profile is 5+3.And can we add multiple disks at the same time in the new host ? Or should it be 1 at a time ?Karun_________________
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