root@stor-mgt01:~# ceph tell osd.30 bench 196608000 65536
> {
> "bytes_written": 196608000,
> "blocksize": 65536,
> "elapsed_sec": 1.081617,
> "bytes_per_sec": 181772360.338257,
> "iops": 2773.626104
> }
> root@stor-mgt01:~#
I tested osd bench with different block size: 1MB, 512KB, 256KB, 128KB, 64KB,
and 32KB. osd.2 is one from the cluster where osds have better 4KB osd bench,
and osd.30 is from the cluster where osds have lower 4KB osd bench.
Before 32KB, osd.30 was better than osd.2, however, there was a big dro
Hi Zhenshi,
I did try with bigger block size. Interestingly, the one whose 4KB osd bench
was lower performed slightly better in 4MB osd bench.
Let me try some other bigger block sizes, e.g. 16K, 64K, 128K, 1M etc, to see
if there is any pattern.
Moreover, I did compare two SSDs, they respec
rence, but I am not sure if it can make two times difference.
>
> ---Original---
> *From:* "Zhenshi Zhou"
> *Date:* Wed, Jul 15, 2020 18:39 PM
> *To:* "rainning";
> *Cc:* "ceph-users";
> *Subject:* [ceph-users] Re: osd bench with or without a separ
one more thing it seems that WAL does have more impact on small write.
---Original---
From: "Zhenshi Zhou"
Hi Zhenshi, thanks very much for the reply.
Yes I know it is ood that the bluestore is deployed only with a separate db
device but no a WAL device. The cluster was deployed in k8s using rook. I
was told it was because the rook we used didn't support that.
Moreover, the comparison was made on
I deployed the cluster either with separate db/wal or put db/wal/data
together. Never tried to have only a seperate db.
AFAIK wal does have an effect on writing but I'm not sure if it could be
two times of the bench value. Hardware and
network environment are also important factors.
rainning 于202
