Hi, This is a good suggestion. Unfortunately, I've already tried striping the RBD images, and it didn't provide much of an effect. I.e. I striped an image, stripe count 2 and size 2 MB, and it performed almost exactly the same as a non-striped image. Z On Thu, Nov 11, 2021 at 8:24 PM 胡 玮文 <huww98@xxxxxxxxxxx> wrote: > 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 <zakhar@xxxxxxxxx> > *发送时间: *2021年11月11日 20:54 > *收件人: *ceph-users <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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