Hi folks! I have a Ceph production 17.2.6 cluster with 6 machines in it - four newer, faster machines with 4x3.84TB NVME drives each, and two with 24x1.68TB SAS disks each. I know I should have done something smart with the CRUSH maps for this up front, but until now I have shied away from CRUSH maps as they sound really complex. Right now my cluster's performance, especially write performance, is not what it needs to be, and I am looking for advice: 1. How should I be structuring my crush map, and why? 2. How does one actually edit and manage a CRUSH map? What /commands/ does one use? This isn't clear at all in the documentation. Are there any GUI tools out there for managing CRUSH? 3. Is this going to impact production performance or availability while I'm configuring it? I have tens of thousands of users relying on this thing, so I can't take any risks. Thanks in advance! -- Regards, Thorne Lawler - Senior System Administrator *DDNS* | ABN 76 088 607 265 First registrar certified ISO 27001-2013 Data Security Standard ITGOV40172 P +61 499 449 170 _DDNS /_*Please note:* The information contained in this email message and any attached files may be confidential information, and may also be the subject of legal professional privilege. _If you are not the intended recipient any use, disclosure or copying of this email is unauthorised. _If you received this email in error, please notify Discount Domain Name Services Pty Ltd on 03 9815 6868 to report this matter and delete all copies of this transmission together with any attachments. /