These values shouldn't be true to be able to do triming? "bdev_async_discard": "false", "bdev_enable_discard": "false", Istvan Szabo Staff Infrastructure Engineer --------------------------------------------------- Agoda Services Co., Ltd. e: istvan.szabo@xxxxxxxxx<mailto:istvan.szabo@xxxxxxxxx> --------------------------------------------------- ________________________________ From: David C. <david.casier@xxxxxxxx> Sent: Monday, December 4, 2023 3:44 PM To: Szabo, Istvan (Agoda) <Istvan.Szabo@xxxxxxxxx> Cc: Anthony D'Atri <anthony.datri@xxxxxxxxx>; Ceph Users <ceph-users@xxxxxxx> Subject: Re: How to identify the index pool real usage? Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ Hi, A flash system needs free space to work efficiently. Hence my hypothesis that fully allocated disks need to be notified of free blocks (trim) ________________________________________________________ Cordialement, David CASIER ________________________________________________________ Le lun. 4 déc. 2023 à 06:01, Szabo, Istvan (Agoda) <Istvan.Szabo@xxxxxxxxx<mailto:Istvan.Szabo@xxxxxxxxx>> a écrit : With the nodes that has some free space on that namespace, we don't have issue, only with this which is weird. ________________________________ From: Anthony D'Atri <anthony.datri@xxxxxxxxx<mailto:anthony.datri@xxxxxxxxx>> Sent: Friday, December 1, 2023 10:53 PM To: David C. <david.casier@xxxxxxxx<mailto:david.casier@xxxxxxxx>> Cc: Szabo, Istvan (Agoda) <Istvan.Szabo@xxxxxxxxx<mailto:Istvan.Szabo@xxxxxxxxx>>; Ceph Users <ceph-users@xxxxxxx<mailto:ceph-users@xxxxxxx>> Subject: Re: How to identify the index pool real usage? Email received from the internet. If in doubt, don't click any link nor open any attachment ! ________________________________ >> >> Today we had a big issue with slow ops on the nvme drives which holding >> the index pool. >> >> Why the nvme shows full if on ceph is barely utilized? Which one I should >> belive? >> >> When I check the ceph osd df it shows 10% usage of the osds (1x 2TB nvme >> drive has 4x osds on it): Why split each device into 4 very small OSDs? You're losing a lot of capacity to overhead. >> >> ID CLASS WEIGHT REWEIGHT SIZE RAW USE DATA OMAP META AVAIL %USE VAR PGS STATUS >> 195 nvme 0.43660 1.00000 447 GiB 47 GiB 161 MiB 46 GiB 656 MiB 400 GiB 10.47 0.21 64 up >> 252 nvme 0.43660 1.00000 447 GiB 46 GiB 161 MiB 45 GiB 845 MiB 401 GiB 10.35 0.21 64 up >> 253 nvme 0.43660 1.00000 447 GiB 46 GiB 229 MiB 45 GiB 662 MiB 401 GiB 10.26 0.21 66 up >> 254 nvme 0.43660 1.00000 447 GiB 46 GiB 161 MiB 44 GiB 1.3 GiB 401 GiB 10.26 0.21 65 up >> 255 nvme 0.43660 1.00000 447 GiB 47 GiB 161 MiB 46 GiB 1.2 GiB 400 GiB 10.58 0.21 64 up >> 288 nvme 0.43660 1.00000 447 GiB 46 GiB 161 MiB 44 GiB 1.2 GiB 401 GiB 10.25 0.21 64 up >> 289 nvme 0.43660 1.00000 447 GiB 46 GiB 161 MiB 45 GiB 641 MiB 401 GiB 10.33 0.21 64 up >> 290 nvme 0.43660 1.00000 447 GiB 45 GiB 229 MiB 44 GiB 668 MiB 402 GiB 10.14 0.21 65 up >> >> However in nvme list it says full: >> Node SN Model Namespace Usage Format FW Rev >> ---------------- -------------------- --------------------------------------- --------- >> -------------------------- ---------------- -------- >> /dev/nvme0n1 90D0A00XTXTR KCD6XLUL1T92 1 1.92 TB / 1.92 TB 512 B + 0 B GPK6 >> /dev/nvme1n1 60P0A003TXTR KCD6XLUL1T92 1 1.92 TB / 1.92 TB 512 B + 0 B GPK6 That command isn't telling you what you think it is. It has no awareness of actual data, it's looking at NVMe namespaces. >> >> With some other node the test was like: >> >> * if none of the disk full, no slow ops. >> * If 1x disk full and the other not, has slow ops but not too much >> * if none of the disk full, no slow ops. >> >> The full disks are very highly utilized during recovery and they are >> holding back the operations from the other nvmes. >> >> What's the reason that even if the pgs are the same in the cluster +/-1 >> regarding space they are not equally utilized. >> >> Thank you >> >> >> >> ________________________________ >> This message is confidential and is for the sole use of the intended >> recipient(s). It may also be privileged or otherwise protected by copyright >> or other legal rules. If you have received it by mistake please let us know >> by reply email and delete it from your system. It is prohibited to copy >> this message or disclose its content to anyone. Any confidentiality or >> privilege is not waived or lost by any mistaken delivery or unauthorized >> disclosure of the message. All messages sent to and from Agoda may be >> monitored to ensure compliance with company policies, to protect the >> company's interests and to remove potential malware. Electronic messages >> may be intercepted, amended, lost or deleted, or contain viruses. >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx<mailto:ceph-users@xxxxxxx> >> To unsubscribe send an email to ceph-users-leave@xxxxxxx<mailto:ceph-users-leave@xxxxxxx> >> > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx<mailto:ceph-users@xxxxxxx> > To unsubscribe send an email to ceph-users-leave@xxxxxxx<mailto:ceph-users-leave@xxxxxxx> ________________________________ This message is confidential and is for the sole use of the intended recipient(s). It may also be privileged or otherwise protected by copyright or other legal rules. If you have received it by mistake please let us know by reply email and delete it from your system. It is prohibited to copy this message or disclose its content to anyone. Any confidentiality or privilege is not waived or lost by any mistaken delivery or unauthorized disclosure of the message. All messages sent to and from Agoda may be monitored to ensure compliance with company policies, to protect the company's interests and to remove potential malware. Electronic messages may be intercepted, amended, lost or deleted, or contain viruses. _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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