We have two identical machines (A and B) both equipped with 192 GiB RAM.
The first one runs 10 VMs using 16,000 MB RAM each plus two smaller VMs
with less than 3 GiB RAM:
[root@A ~]# echo ::memstat | mdb -k
Page Summary Pages MB %Tot
------------ ---------------- ---------------- ----
Kernel 3726258 14555 7%
Boot pages 68306 266 0%
ZFS File Data 2976930 11628 6%
Anon 41622277 162587 83%
Exec and libs 5473 21 0%
Page cache 22635 88 0%
Free (cachelist) 25908 101 0%
Free (freelist) 1879280 7340 4%
Total 50327067 196590
Physical 50327066 196590
[root@A ~]# mdb -ke 'availrmem/D ; pages_pp_maximum/D'
availrmem:
availrmem: 2350836
pages_pp_maximum:
pages_pp_maximum: 1947905
There are 2,350,836 pages of 4,096 bytes available resident memory which
seems reasonable. However, on machine B we could create no more than
six VMs with 16,000 MB RAM before we get timeouts. Here are its
figures:
[root@B ~]# echo ::memstat | mdb -k
Page Summary Pages MB %Tot
------------ ---------------- ---------------- ----
Kernel 2532099 9891 5%
Boot pages 68306 266 0%
ZFS File Data 169799 663 0%
Anon 26373657 103022 52%
Exec and libs 4432 17 0%
Page cache 14865 58 0%
Free (cachelist) 13798 53 0%
Free (freelist) 21150107 82617 42%
Total 50327063 196590
Physical 50327062 196590
[root@B ~]# mdb -ke 'availrmem/D ; pages_pp_maximum/D'
availrmem:
availrmem: 8122046
pages_pp_maximum:
pages_pp_maximum: 1947905
On this machine vmadm create failed with
timed out waiting for /var/svc/provisioning to move for $uuid
A: joyent_20160218T022556Z
B: joyent_20160317T000621Z
Any ideas?
Thanks in advance,
Stefan
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