Yes, operations within the OSD are ordered on a per-PG basis, a read will be blocked until the writes are applied.
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx]
On Behalf Of Sam Huracan
Sent: Tuesday, January 26, 2016 2:26 PM
To: Loris Cuoghi
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: [ceph-users] Ceph Write process
Thanks Loris,
So after client receiving ACK, if client makes a read request to this object immediately , does it have to wait for object written to file store, or read directly from journal?
2016-01-25 17:12 GMT+07:00 Loris Cuoghi <lc@xxxxxxxxxxxxxxxxx>:
Le 25/01/2016 11:04, Sam Huracan a écrit :
> Hi Cephers,
>
> When an Ceph write made, does it write to all File Stores of Primary OSD
> and Secondary OSD before sending ACK to client, or it writes to journal
> of OSD and sending ACK without writing to File Store?
>
> I think it would write to journal of all OSD, so using SSD journal will
> increase write IOPS.
Hi
That's it, writes are acknowledged as soon as they're written to each OSD's journal.
Loris
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