Hi,
For every CONSECUTIVE ran of the "ceph tell osd.x bench" command
I get different and MUCH worse results
Is this expected ?
OSD was created with the following command ( /dev/sda is an Entreprise class SDD)
ceph-deploy osd create --zap-disk --bluestore osd01:sdc --block-db /dev/sda --block-wal /dev/sda
If not, what could cause it ?
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 440630335
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 313287177
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 251350160
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 244450342
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 253622108
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 253355474
}
[root@osd01 ~]# ceph tell osd.0 bench
{
"bytes_written": 1073741824,
"blocksize": 4194304,
"bytes_per_sec": 252890400
[root@osd01 ~]# megacli -LDGetProp -DskCache -L3 -a0
Adapter 0-VD 3(target id: 3): Disk Write Cache : Enabled
Exit Code: 0x00
[root@osd01 ~]# megacli -LDGetProp -Cache -L3 -a0
Adapter 0-VD 3(target id: 3): Cache Policy:WriteBack, ReadAdaptive, Cached, Write Cache OK if bad BBU
mount
/dev/sdd1 on /var/lib/ceph/osd/ceph-0 type xfs (rw,noatime,nodiratime,swalloc,attr2,largeio,inode64,allocsize=4096k,logbufs=8,logbsize=256k,noquota)
[root@osd01 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sdf 8:80 0 59.8G 0 disk
├─sdf5 8:85 0 37G 0 part /var
├─sdf3 8:83 0 6G 0 part [SWAP]
├─sdf1 8:81 0 1G 0 part /boot
├─sdf4 8:84 0 1K 0 part
└─sdf2 8:82 0 15.5G 0 part /
sdd 8:48 0 558.4G 0 disk
├─sdd2 8:50 0 558.3G 0 part
└─sdd1 8:49 0 100M 0 part /var/lib/ceph/osd/ceph-0
sdb 8:16 0 558.4G 0 disk
sr0 11:0 1 1024M 0 rom
sde 8:64 0 558.4G 0 disk
sdc 8:32 0 558.4G 0 disk
├─sdc2 8:34 0 558.3G 0 part
└─sdc1 8:33 0 100M 0 part /var/lib/ceph/osd/ceph-3
sda 8:0 0 372G 0 disk
├─sda4 8:4 0 1G 0 part
├─sda2 8:2 0 1G 0 part
├─sda3 8:3 0 30G 0 part
└─sda1 8:1 0 30G 0 part
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