Re: Deep scrubbing causes severe I/O stalling

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



I would suggest deadline for any ssd, nvme ssd, or pcie flash card. But, you will need to supply the deadline settings too or deadline won't be any different than running with noop 

Rick 
Sent from my iPhone, please excuse any typing errors.

> On Oct 31, 2016, at 5:01 AM, Wido den Hollander <wido@xxxxxxxx> wrote:
> 
> 
>> Op 28 oktober 2016 om 15:37 schreef Kees Meijs <kees@xxxxxxxx>:
>> 
>> 
>> Hi,
>> 
>> Interesting... We're now running using deadline. In other posts I read
>> about noop for SSDs instead of CFQ.
>> 
>> Since we're using spinners with SSD journals; does it make since to mix
>> the scheduler? E.g. CFG for spinners _and_ noop for SSD?
>> 
> 
> Yes, CFQ for the spinners and noop for the SSD is good. The scrubbing doesn't touch the journal anyway.
> 
> Wido
> 
>> K.
>> 
>>> On 28-10-16 14:43, Wido den Hollander wrote:
>>> Make sure you use the CFQ disk scheduler for your disks though.
>> 
>> _______________________________________________
>> ceph-users mailing list
>> ceph-users@xxxxxxxxxxxxxx
>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> _______________________________________________
> ceph-users mailing list
> ceph-users@xxxxxxxxxxxxxx
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com



[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux