Hi Stefan,
thank you for your time. "temporary write through" does not seem to be a legit parameter. However write through is already set: root@proxmox61:~# echo "temporary write through" > /sys/block/sdb/device/scsi_disk/*/cache_type root@proxmox61:~# cat /sys/block/sdb/device/scsi_disk/2\:0\:0\:0/cache_type write through is that, what you meant? Thank you. KR Stefan -----Ursprüngliche Nachricht----- Von: Stefan Priebe - Profihost AG <s.pri...@profihost.ag> this has something todo with the firmware and how the manufacturer handles syncs / flushes. Intel just ignores sync / flush commands for drives which have a capacitor. Samsung does not. The problem is that Ceph sends a lot of flush commands which slows down drives without capacitor. You can make linux to ignore those userspace requests with the following command: echo "temporary write through" > /sys/block/sdX/device/scsi_disk/*/cache_type Greets, Stefan Priebe Profihost AG > Thank you. > > > Stefan > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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