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Hi, thanks, i'll keep this in mind for next ssd still Samsung_SSD_860_EVO_1TB without PLP is working fine

perf is now acceptable without those 1TB ssd: CT1000BX500SSD1 CT1000BX500SSD1 SPCC_Solid_State_Disk only one 1TB ssd is now in ceph and is doing fine, latency bellow 30 ms: Samsung_SSD_860_EVO_1TB this one also does not have PLP, what is the secret ?

thanks for info. i don't understand how could hdd be faster and with less latency than ssd ? Now we have 5 prod vm on just 4 hdd in 3 pc and perf is ok. Is there no way to tell ceph to use ssd like hdd, with less threads and ... ? This is small site with very low IO and small budget

update, i've cloned 3 vm from ssd to hdd pool and situation it's much better now. Stress test is writing around 60MB/s to disk and through network (1Gpbs). No more slowdons, latency on hdd goes to max 300ms. I'm planning to change ssd device-class from ssd to hdd for now. Any other thoughts ?

Hi, ssd and hdd: sda KINGSTON_SM2280S3G2120G sdb TOSHIBA_HDWD130 sdc Samsung_SSD_870_EVO_500GB sdd KINGSTON_SM2280S3G2120G sde CT240BX500SSD1 sda TOSHIBA_HDWD120 sdb KINGSTON_SA400S37240G sdc KINGSTON_SA400S37240G sdd KINGSTON_SH103S3240G sde SPCC_Solid_State_Disk sdf...

Hi, i'm trying to lower write latency on ceph ssd without success. env: small prod site, v 7.1.10.3 pc, 1Gpbs. 13 ceph entry ssd with different sizes, from 200GB do 1TB, older ones. 10 vm linux, not IO demanding. I had similar problem with elastic and hdd, default options was to many threads...

Hi, I had very similar problem, maybe will help someone. Ceph -s hung, Long story short, 2 of 3 nodes / was disk full, monitors down and no quorum. Fortunately quick fix.

yes, logstash is heavy cpu user with grok, netflow ... Our setup: dell 740xd, 12C/256 RAM, only one redhat, 2 ES nodes (2 *31GB heap), 3 logstash instances (12g heap), and lots of RAM for cache

Hi, thanks for answers, sorry for delay. our elk is heavy on IO, around 0,5TB input per day, ~ 250 TB in ES. Hot+warm ES nodes, SSD + spinning disks. We had problems with perf...

is it possible to install Elasticsearch (or ELK) directly on debian (not KVM or LXC) for perf reason ? That combination would be perfect for us, elk on HW, then lot of services in vm-s and containers.