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Mon Dec 9 19:55:22 CET 2019


y 80 MB/s per volume.
(Strictly speaking, is DRBD reading 80MB/s per volume?)

2. Related to the previous question,=C2=A0
can DRBD provide a fast sync rate (For example, about 1.25 GB/s) for a one =
volume?
In our project, we want to achieve fast synchronization speed with less vol=
ume.
For example, is it possible to achieve a sync rate of 1.25 GB/s with only 4=
 volumes?

3. Is the maximum number of peers in DRBD 32?
The drbdadm command with the following options completes successfully:
=C2=A0 # drbdadm create-md --max-peers 32 r0
("--max-peers 33" results in an error.)
Defined in the drbd-utils source code as follows:
https://github.com/LINBIT/drbd-utils/blob/master/user/v84/linux/drbd.h
=C2=A0 #define MAX_PEERS 32
However, resynchronization does not work well with the metadata created by =
the above command.
Resynchronization works well with metadata created with "--max-peers" set t=
o 31.
Is the maximum number of peers in DRBD really 32?

The DRBD version and the DRBD Utils version and OS version used are as foll=
ows:
DRBD: 9.0.16 (kmod-drbd90-9.0.16-1.el7_6.elrepo.x86_64.rpm)
DRBD Utils: 9.6.0 (drbd90-utils-9.6.0-1.el7.elrepo.x86_64.rpm)
OS: Red Hat Enterprise Linux 7.6

Thanks!

- tsubaki


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