Re: [ceph-users] Mount options nodcache and nofsc

2015-05-21 Thread Yan, Zheng
On Fri, May 22, 2015 at 1:57 PM, Francois Lafont wrote: > Hi, > > Yan, Zheng wrote: > >> fsc means fs-cache. it's a kernel facility by which a network >> filesystem can cache data locally, trading disk space to gain >> performance improvements for access to slow networks and media. cephfs >> does

Re: [ceph-users] Mount options nodcache and nofsc

2015-05-21 Thread Francois Lafont
Hi, Yan, Zheng wrote: > fsc means fs-cache. it's a kernel facility by which a network > filesystem can cache data locally, trading disk space to gain > performance improvements for access to slow networks and media. cephfs > does not use fs-cache by default. So enable this option can improve pe

Re: [ceph-users] Mount options nodcache and nofsc

2015-05-21 Thread Yan, Zheng
On Fri, May 22, 2015 at 6:14 AM, Erik Logtenberg wrote: > Hi, > > Can anyone explain what the mount options nodcache and nofsc are for, > and especially why you would want to turn these options on/off (what are > the pros and cons either way?) nodcache mount option make cephfs kernel driver not t