This server configured Dell R730 with HBA 330 card HDD are configured write through mode. ________________________________ From: David C. &lt;david.casier(a)aevoo.fr&gt; Sent: Wednesday, November 8, 2023 10:14 To: Peter &lt;petersun(a)raksmart.com&gt; Cc: ceph-users(a)ceph.io &lt;ceph-users(a)ceph.io&gt; Subject: Re: [ceph-users] HDD cache Without (raid/jbod) controller ? Le mer. 8 nov. 2023 à 18:36, Peter <petersun@raksmart.com<mailto:petersun@raksmart.com>> a écrit : Hi All, I note that HDD cluster commit delay improves after i turn off HDD cache. However, i also note that not all HDDs are able to turn off the cache. special I found that two HDD with same model number, one can turn off, anther doesn't. i guess i have my system config or something different setting with two HDDs. Below is my command to turn off the HDD cache. root@lahost008:~# sdparm --set WCE=0 /dev/sdb /dev/sdb: ATA ST10000NE000-3AP EN01 root@lahost008:~# cat /sys/block/sdb/queue/write_cache write through I also tried sdparm to run "sdparm --set WCE=0 /dev/sdb" I got the same result. Anyone experienced this can advise? Thanks a lot _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io<mailto:ceph-users@ceph.io> To unsubscribe send an email to ceph-users-leave@ceph.io<mailto:ceph-users-leave@ceph.io>