> Op 8 maart 2017 om 0:35 schreef Matteo Dacrema <mdacr...@enter.eu>: > > > Thank you Adrian! > > I’ve forgot this option and I can reproduce the problem. > > Now, what could be the problem on ceph side with O_DSYNC writes? >
As mentioned nothing, but what you can do with MySQL is provide it multiple RBD disks, eg: - Disk for Operating System - Disk for /var/lib/mysql - Disk for InnoDB data - Disk for InnoDB log - Disk for /var/log/mysql (binary logs) That way you can send in more parallel I/O into the Ceph cluster and gain more performance. Wido > Regards > Matteo > > > -------------------------------------------- > This email and any files transmitted with it are confidential and intended > solely for the use of the individual or entity to whom they are addressed. If > you have received this email in error please notify the system manager. This > message contains confidential information and is intended only for the > individual named. If you are not the named addressee you should not > disseminate, distribute or copy this e-mail. Please notify the sender > immediately by e-mail if you have received this e-mail by mistake and delete > this e-mail from your system. If you are not the intended recipient you are > notified that disclosing, copying, distributing or taking any action in > reliance on the contents of this information is strictly prohibited. > > > Il giorno 08 mar 2017, alle ore 00:25, Adrian Saul > > <adrian.s...@tpgtelecom.com.au> ha scritto: > > > > > > Possibly MySQL is doing sync writes, where as your FIO could be doing > > buffered writes. > > > > Try enabling the sync option on fio and compare results. > > > > > >> -----Original Message----- > >> From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of > >> Matteo Dacrema > >> Sent: Wednesday, 8 March 2017 7:52 AM > >> To: ceph-users > >> Subject: [ceph-users] MySQL and ceph volumes > >> > >> Hi All, > >> > >> I have a galera cluster running on openstack with data on ceph volumes > >> capped at 1500 iops for read and write ( 3000 total ). > >> I can’t understand why with fio I can reach 1500 iops without IOwait and > >> MySQL can reach only 150 iops both read or writes showing 30% of IOwait. > >> > >> I tried with fio 64k block size and various io depth ( 1.2.4.8.16….128) > >> and I > >> can’t reproduce the problem. > >> > >> Anyone can tell me where I’m wrong? > >> > >> Thank you > >> Regards > >> Matteo > >> > >> _______________________________________________ > >> ceph-users mailing list > >> ceph-users@lists.ceph.com > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > Confidentiality: This email and any attachments are confidential and may be > > subject to copyright, legal or some other professional privilege. They are > > intended solely for the attention and use of the named addressee(s). They > > may only be copied, distributed or disclosed with the consent of the > > copyright owner. If you have received this email by mistake or by breach of > > the confidentiality clause, please notify the sender immediately by return > > email and delete or destroy all copies of the email. Any confidentiality, > > privilege or copyright is not waived or lost because this email has been > > sent to you by mistake. > > > > -- > > Questo messaggio e' stato analizzato con Libra ESVA ed e' risultato non > > infetto. > > Seguire il link qui sotto per segnalarlo come spam: > > http://mx01.enter.it/cgi-bin/learn-msg.cgi?id=13CCD402D0.AA534 > > > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
