The proper way to prevent this is to set your full ratios safe and monitor your disk usage. That will allow you to either clean up old data or add new storage before you get to 95 full on any OSDs. What I mean by setting your full ratios safe is that if your use case can fill 20% of your disk space within a couple days, then having your warnings start at 75% is too high because you can easily fill up the rest of your space within a couple days and then need more storage before you have it ready.
There is no method to allow read-only while OSDs are full.
On Mon, Apr 9, 2018 at 6:58 AM 渥美 慶彦 <atsumi.yoshihiko@xxxxxxxxxxxxxxx> wrote:
Hi,
I have 2 questions.
I want to use ceph for OpenStack's volume backend by creating 2 ceph pools.
One pool consists of osds on SSD, and the other consists of osds on HDD.
The storage capacity of SSD pool is much smaller than that of HDD pool,
so I want to make configuration not to stop all IO even if one osd on
SSD becomes full.
Is this possible?
"osd full ratio" is default to 0.95, and if one osd becomes full, then
all osd will stop.
Is there any configuration to allow us to read-only while one or more
osds are full?
best regards,
--
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Atsumi Yoshihiko
E-mail：atsumi.yoshihiko@xxxxxxxxxxxxxxx
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