Hi!
If you have planty of RAM you could configure an iSCSI disk using a ram disk
and try how much I/O you get from there.
Maybe you issue is not-su-much DRBD related. However when my local MD-RAID1
resyncs with about 120MB/s (spinning disks), the system also is hardly usable.
Regards,
Ulrich
>>> Tyler Phillippe via Users <users@clusterlabs.org> schrieb am 13.11.2022 um
19:26 in Nachricht <ngme_x7--...@tutamail.com>:
> Hello all,
>
> I have setup a Linux cluster on 2x CentOS 8 Stream machines - it has
> resources to manage a dual primary, GFS2 DRBD setup. DRBD and the cluster
> have a diskless witness. Everything works fine - I have the dual primary DRBD
> working and it is able to present an iSCSI LUN out to my LAN. However, the
> DRBD write speed is terrible. The backing DRBD disks (HDD) are RAID10 using
> mdadm and they (re)sync at around 150MB/s. DRBD verify has been limited to
> 100MB/s, but left untethered, it will get to around 140MB/s. If I write data
> to the iSCSI LUN, I only get about 10-15MB/s. Here's the DRBD
> global_common.conf - these are exactly the same on both machines:
>
> global {
> usage-count no;
> udev-always-use-vnr;
> }
>
> common {
> handlers {
> }
>
> startup {
> wfc-timeout 5;
> degr-wfc-timeout 5;
> }
>
> options {
> auto-promote yes;
> quorum 1;
> on-no-data-accessible suspend-io;
> on-no-quorum suspend-io;
> }
>
> disk {
> al-extents 4096;
> al-updates yes;
> no-disk-barrier;
> disk-flushes;
> on-io-error detach;
> c-plan-ahead 0;
> resync-rate 100M;
> }
>
> net {
> protocol C;
> allow-two-primaries yes;
> cram-hmac-alg "sha256";
> csums-alg "sha256";
> verify-alg "sha256";
> shared-secret "secret123";
> max-buffers 36864;
> rcvbuf-size 5242880;
> sndbuf-size 5242880;
> }
> }
>
> Respectfully,
> Tyler
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