Thanks Irek.
Does this mean, that after peering for each PG, there will be delay of 10sec, meaning that every once in a while, I will have 10sec od the cluster NOT being stressed/overloaded, and then the recovery takes place for that PG, and then another 10sec cluster is fine, and then stressed again ?
I'm trying to understand process before actually doing stuff (config reference is there on ceph.com but I don't fully understand the process)
Thanks,
Andrija
On 3 March 2015 at 11:32, Irek Fasikhov <malmyzh@xxxxxxxxx> wrote:
Hi.Use value "osd_recovery_delay_start"example:[root@ceph08 ceph]# ceph --admin-daemon /var/run/ceph/ceph-osd.94.asok config show | grep osd_recovery_delay_start"osd_recovery_delay_start": "10"2015-03-03 13:13 GMT+03:00 Andrija Panic <andrija.panic@xxxxxxxxx>:_______________________________________________HI Guys,I yesterday removed 1 OSD from cluster (out of 42 OSDs), and it caused over 37% od the data to rebalance - let's say this is fine (this is when I removed it frm Crush Map).I'm wondering - I have previously set some throtling mechanism, but during first 1h of rebalancing, my rate of recovery was going up to 1500 MB/s - and VMs were unusable completely, and then last 4h of the duration of recover this recovery rate went down to, say, 100-200 MB.s and during this VM performance was still pretty impacted, but at least I could work more or a lessSo my question, is this behaviour expected, is throtling here working as expected, since first 1h was almoust no throtling applied if I check the recovery rate 1500MB/s and the impact on Vms.And last 4h seemed pretty fine (although still lot of impact in general)I changed these throtling on the fly with:ceph tell osd.* injectargs '--osd_recovery_max_active 1'ceph tell osd.* injectargs '--osd_recovery_op_priority 1'ceph tell osd.* injectargs '--osd_max_backfills 1'My Jorunals are on SSDs (12 OSD per server, of which 6 journals on one SSD, 6 journals on another SSD) - I have 3 of these hosts.Any thought are welcome.--Andrija Panić
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Andrija Panić
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