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.priebe@xxxxxxxxxxxx>
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
>
>
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