Re: [ceph-users] Is OSDs based on VFS?
Thanks for your rapid reply - Jae On Tue, Jul 22, 2014 at 1:28 AM, Kyle Bader wrote: > > I wonder that OSDs use system calls of Virtual File System (i.e. open, > read, > > write, etc) when they access disks. > > > > I mean ... Could I monitor I/O command requested by OSD to disks if I > > monitor VFS? > > Ceph OSDs run on top of a traditional filesystem, so long as they > support xattrs - xfs by default. As such you can use kernel > instrumentation to view what is going on "under" the Ceph OSDs. > > -- > > Kyle > > -- 이재면 Jaemyoun Lee CPS Lab. ( Cyber-Physical Systems Laboratory in Hanyang University) E-mail : jm...@cpslab.hanyang.ac.kr Homepage : http://cpslab.hanyang.ac.kr ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Is OSDs based on VFS?
Thanks for your rapid reply - Jae On Tue, Jul 22, 2014 at 1:29 AM, Gregory Farnum wrote: > On Monday, July 21, 2014, Jaemyoun Lee wrote: > >> Hi all, >> >> I wonder that OSDs use system calls of Virtual File System (i.e. open, >> read, write, etc) when they access disks. >> >> I mean ... Could I monitor I/O command requested by OSD to disks if I >> monitor VFS? >> > > Yes. The default configuration stores data in a local filesystem and > accesses it like any other sophisticated filesystem consumer. > -Greg > > >> >> - Jae >> >> -- >> 이재면 Jaemyoun Lee >> >> CPS Lab. ( Cyber-Physical Systems Laboratory in Hanyang University) >> E-mail : jm...@cpslab.hanyang.ac.kr >> Homepage : http://cpslab.hanyang.ac.kr >> > > > -- > Software Engineer #42 @ http://inktank.com | http://ceph.com > -- 이재면 Jaemyoun Lee CPS Lab. ( Cyber-Physical Systems Laboratory in Hanyang University) E-mail : jm...@cpslab.hanyang.ac.kr Homepage : http://cpslab.hanyang.ac.kr ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Is OSDs based on VFS?
On Monday, July 21, 2014, Jaemyoun Lee wrote: > Hi all, > > I wonder that OSDs use system calls of Virtual File System (i.e. open, > read, write, etc) when they access disks. > > I mean ... Could I monitor I/O command requested by OSD to disks if I > monitor VFS? > Yes. The default configuration stores data in a local filesystem and accesses it like any other sophisticated filesystem consumer. -Greg > > - Jae > > -- > 이재면 Jaemyoun Lee > > CPS Lab. ( Cyber-Physical Systems Laboratory in Hanyang University) > E-mail : jm...@cpslab.hanyang.ac.kr > > Homepage : http://cpslab.hanyang.ac.kr > -- Software Engineer #42 @ http://inktank.com | http://ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Is OSDs based on VFS?
> I wonder that OSDs use system calls of Virtual File System (i.e. open, read, > write, etc) when they access disks. > > I mean ... Could I monitor I/O command requested by OSD to disks if I > monitor VFS? Ceph OSDs run on top of a traditional filesystem, so long as they support xattrs - xfs by default. As such you can use kernel instrumentation to view what is going on "under" the Ceph OSDs. -- Kyle ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
