I have an odd situation with resync.
Resync seems to always be limited to max 40MB/s, if I am doing both of my resources at the same time then both are at
40MB/s (total 80M), but never goes above this.
If I copy a 20G file which is on drbd then the sync speed to the other server reaches 800GB/s, doing a dd gives similar
results around 1GB/s.
Does not matter what param I tweek i can not get the sync speed to be above
40MB/s.
To test that cachecade is not getting in the way I have disabled it for tests
but nothing changed.
This server has been running 8.4.3 up to recently, now 8.4.6.
Before the upgrade I am sure when I did a sync I saw much higher resync rates.
The server setup is:
16x 3TB SAS 7.2k RAID 6 on LSI Megaraid 9271-4i (FBWC + CacheCade)
10G Ethernet direct link between servers
Config:
resource d0 {
options {
cpu-mask ""; # default
on-no-data-accessible io-error; # default
}
net {
protocol C; # default
timeout 60; # 1/10 seconds, default
max-epoch-size 2048; # default
max-buffers 2048; # default
unplug-watermark 128; # default
connect-int 10; # seconds, default
ping-int 10; # seconds, default
sndbuf-size 0; # bytes, default
rcvbuf-size 0; # bytes, default
ko-count 7; # default
allow-two-primaries no; # default
cram-hmac-alg ""; # default
shared-secret ""; # default
after-sb-0pri disconnect; # default
after-sb-1pri disconnect; # default
after-sb-2pri disconnect; # default
always-asbp no; # default
rr-conflict disconnect; # default
ping-timeout 5; # 1/10 seconds, default
data-integrity-alg ""; # default
tcp-cork yes; # default
on-congestion block; # default
congestion-fill 0s; # bytes, default
congestion-extents 1237; # default
csums-alg ""; # default
csums-after-crash-only no; # default
verify-alg "crc32c";
use-rle yes; # default
socket-check-timeout 0; # default
}
_remote_host {
address ipv4 192.168.10.1:7789;
}
_this_host {
address ipv4 192.168.10.2:7789;
volume 0 {
device minor 1;
disk "/dev/vg_raid1/drbd0";
meta-disk internal;
disk {
size 0s; # bytes, default
max-bio-bvecs 0; # default
on-io-error detach; # default
fencing resource-only;
disk-barrier no; # default
disk-flushes no;
disk-drain yes; # default
md-flushes yes; # default
resync-rate 512000k; # bytes/second
resync-after -1; # default
al-extents 1237; # default
al-updates yes; # default
c-plan-ahead 0; # 1/10 seconds
c-delay-target 10; # 1/10 seconds, default
c-fill-target 100s; # bytes, default
c-max-rate 102400k; # bytes/second, default
c-min-rate 250k; # bytes/second, default
disk-timeout 0; # 1/10 seconds, default
read-balancing prefer-local; # default
}
}
}
}
0: cs:SyncTarget ro:Secondary/Primary ds:Inconsistent/UpToDate C r-----
ns:0 nr:262361424 dw:325178528 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d
oos:11362364
[==>.................] sync'ed: 15.5% (11096/13116)M
finish: 0:05:15 speed: 35,944 (31,844) want: 512,000 K/sec
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