Hi Zakhar, If you are using RBD, you may be interested in the striping feature. It works like RAID0 and can read from multiple object at once for sequential read requests. https://docs.ceph.com/en/latest/man/8/rbd/#striping Weiwen Hu 从 Windows 版邮件<https://go.microsoft.com/fwlink/?LinkId=550986>发送 发件人: Zakhar Kirpichenko<mailto:zakhar@xxxxxxxxx> 发送时间: 2021年11月11日 20:54 收件人: ceph-users<mailto:ceph-users@xxxxxxx> 主题: Pacific: parallel PG reads? Hi, I'm still trying to combat really bad read performance from HDD-backed replicated pools, which is under 100 MB/s most of the time with 1 thread and QD=1. I don't quite understand why the reads are that slow, i.e. much slower than a single HDD, but do understand that Ceph clients read a PG from primary OSD only. Since reads are immutable, is it possible to make Ceph clients read PG in a RAID1-like fashion, i.e. if a PG has a primary OSD and two replicas, is it possible to read all 3 OSDs in parallel for a 3x performance gain? I would appreciate any advice. Best regards, Zakhar _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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