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Posted Nick Remark
#openstack-nova - 2019-02-07
00:00:23 sean-k-mooney by the way did you do the hard reboot after you restart the nova compute service
00:01:17 mshaikh99 I did hard reboot of VM
00:01:25 mshaikh99 after nova compute service is restarted
00:02:26 mshaikh99 Although after hardreboot of VM, I do see time dd if=/dev/zero of=/tmp/test1 bs=20M count=100 conv=fsync;rm /tmp/test1 100+0 records in 100+0 records out 2097152000 bytes (2.1 GB, 2.0 GiB) copied, 42.8637 s, 48.9 MB/s
00:03:25 mshaikh99 so I guess the option for disk_cachemodes=file=writebac is not used any more. I can remove it from /etc/nova/nova-compute.conf [DEFAULT] compute_driver=libvirt.LibvirtDriver disk_cachemodes=file=writebac
00:03:59 sean-k-mooney well it still exists
00:04:01 sean-k-mooney https://docs.openstack.org/nova/latest/configuration/config.html#libvirt.disk_cachemodes
00:04:06 sean-k-mooney what release are you using again
00:05:00 mshaikh99 Queens
00:05:03 sean-k-mooney file=directsync would be safter then writeback by the way and may give better performance then writethrough
00:05:08 mshaikh99 So I only need to hard reboot and that would have increased the IO
00:06:08 mshaikh99 or I should keep the disk_cachemodes=file=directsync option in DEFAULT section of nova compute config file?
00:06:51 melwitt we had an old bug around that, but it was fixed in queens, so you should have the fix as long as you're running >= 17.0.0.0b2 https://bugs.launchpad.net/nova/+bug/1727558
00:06:52 openstack Launchpad bug 1727558 in OpenStack Compute (nova) pike "libvirt driver ignores 'disk_cachemodes' configuration setting" [High,Fix committed] - Assigned to melanie witt (melwitt)
00:07:24 mshaikh99 I don't see that writebac option was picked up by the nova
00:07:26 mshaikh99 libvirt+ 27386 1 16 15:01 ? 00:03:06 /usr/bin/qemu-system-x86_64 -name guest=instance-00000002,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-22-instance-00000002/master-key.aes -machine pc-i440fx-bionic,accel=tcg,usb=off,dump-guest-core=off -cpu EPYC,acpi=on,ss=on,hypervisor=on,erms=on,mpx=on,pcommit=on,clwb=on,pku=on,ospke=on,3dnowext=on,3dnow=on,vme=off,fma=off,avx
00:07:28 sean-k-mooney mshaikh99: disk_cachemode is part of the [libvirt] sechont not [DEFAULT]
00:08:16 sean-k-mooney mshaikh99: i would set [libvirt] disk_cachemodes=file=directsync
00:08:21 mshaikh99 ok let me try it then
00:09:40 mshaikh99 I have changed it and hard reboot my VM
00:09:58 sean-k-mooney and restarted nova-compute agent
00:11:49 mshaikh99 there is no nova-compute agent runnnig
00:12:20 sean-k-mooney the nova compute agent and nova compute service are the same thing
00:14:16 mshaikh99 ok now I see time dd if=/dev/zero of=/tmp/test1 bs=20M count=100 conv=fsync;rm /tmp/test1 100+0 records in 100+0 records out 2097152000 bytes (2.1 GB, 2.0 GiB) copied, 44.5152 s, 47.1 MB/s real 0m44.655s user 0m0.072s sys 0m40.564s
00:14:30 mshaikh99 about 47.1 MB
00:14:39 mshaikh99 and cache=directsync
00:14:46 mshaikh99 for qemu process on compute node
00:14:53 mshaikh99 thanks for the help
00:20:12 sean-k-mooney mshaikh99: setting the cache mode to writeback will imporve it more
00:20:45 sean-k-mooney mshaikh99: but you need to make sure the servers are UPS backed or you could get data currption with a power outage
00:21:11 sean-k-mooney and all the other issues that go with writeback
00:21:32 sean-k-mooney o/
00:28:07 mshaikh99 is directsync safe
00:28:17 mshaikh99 I mean my server are not UPS backed up
00:28:33 sean-k-mooney yes direct sync is safe
00:28:39 mshaikh99 otherwise I will revert back to none
00:28:59 mshaikh99 Cool
00:29:05 mshaikh99 Thanks Sean
00:29:25 sean-k-mooney cache mode none,writethrough and directsync are considerd eqally safe
00:29:53 sean-k-mooney writeback is less safe and unsafe well its in the name
00:31:33 sean-k-mooney none and directsync tend to have better write performance then writehtrough but writethrough has better read performace
00:32:15 mshaikh99 I will check with my team about the read v/s write use-case
00:32:23 mshaikh99 and will try to setup accordingly
00:32:41 mshaikh99 Can I setup a group of servers for one way and another group for another way
00:32:52 mshaikh99 or it is global parameter?
00:33:04 sean-k-mooney its per compute node
00:33:13 sean-k-mooney so you can use host aggrages to group them
00:33:20 mshaikh99 ok, so I can setup a host aggregate
00:33:23 mshaikh99 ok got it
00:57:10 openstackgerrit Artom Lifshitz proposed openstack/nova master: [WIP] Add migration param to check_can_live_migrate_destination https://review.openstack.org/634605
00:57:11 openstackgerrit Artom Lifshitz proposed openstack/nova master: [WIP] New objects to transmit NUMA config from dest to source https://review.openstack.org/634827
00:57:11 openstackgerrit Artom Lifshitz proposed openstack/nova master: [WIP] Create claims when live migrating https://review.openstack.org/634606
00:57:12 openstackgerrit Artom Lifshitz proposed openstack/nova master: [WIP] Send dest NUMA info inside LiveMigrateData https://review.openstack.org/634828
00:57:13 openstackgerrit Artom Lifshitz proposed openstack/nova master: [WIP] Update NUMA XML during live migration https://review.openstack.org/635229
01:06:40 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (3) https://review.openstack.org/574104
01:07:00 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (4) https://review.openstack.org/574106
01:07:17 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (5) https://review.openstack.org/574110
01:07:32 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (6) https://review.openstack.org/574113
01:07:48 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (7) https://review.openstack.org/574974
01:16:13 openstackgerrit Merged openstack/nova master: Switch tempest-slow to be run on python 3 https://review.openstack.org/634204
02:20:20 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (8) https://review.openstack.org/575311
02:20:24 openstackgerrit Merged openstack/nova stable/rocky: Use X-Forwarded-Proto as origin protocol if present https://review.openstack.org/634814
02:20:37 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (9) https://review.openstack.org/575581
02:20:52 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (10) https://review.openstack.org/576017
02:21:09 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (11) https://review.openstack.org/576018
02:21:25 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (12) https://review.openstack.org/576019
03:52:32 openstackgerrit Sam Morrison proposed openstack/nova-specs master: add spec "flavor-classes" https://review.openstack.org/635408
03:55:36 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (13) https://review.openstack.org/576020
03:55:46 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (14) https://review.openstack.org/576027
03:56:00 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (15) https://review.openstack.org/576031
03:56:16 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (16) https://review.openstack.org/576299
03:56:33 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (17) https://review.openstack.org/576344
05:39:40 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (18) https://review.openstack.org/576673
05:39:49 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (19) https://review.openstack.org/576676
05:40:04 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (20) https://review.openstack.org/576689
05:40:20 openstackgerrit Takashi NATSUME proposed openstack/nova master: Remove mox in unit/network/test_neutronv2.py (21) https://review.openstack.org/576709
06:01:11 openstackgerrit Takashi NATSUME proposed openstack/python-novaclient master: Remove deprecated novaclient.v2.contrib modules https://review.openstack.org/635430
06:05:07 openstackgerrit Sundar Nadathur proposed openstack/nova master: ksa auth conf and client for cyborg access https://review.openstack.org/631242
06:05:08 openstackgerrit Sundar Nadathur proposed openstack/nova master: WIP: Create and bind Cyborg ARQs. https://review.openstack.org/631244
06:05:08 openstackgerrit Sundar Nadathur proposed openstack/nova master: WIP: Add Cyborg device profile groups to spec obj. https://review.openstack.org/631243
06:05:09 openstackgerrit Sundar Nadathur proposed openstack/nova master: WIP: Get resolved Cyborg ARQs and add PCI BDFs to VM's domain XML. https://review.openstack.org/631245
06:18:23 openstackgerrit Michael Still proposed openstack/nova master: Move binding ips to privsep. https://review.openstack.org/622151
06:18:24 openstackgerrit Michael Still proposed openstack/nova master: Create specialist set_macaddr_and_vlan helper. https://review.openstack.org/624227
06:18:24 openstackgerrit Michael Still proposed openstack/nova master: create_veth_pair is unused, remove it. https://review.openstack.org/624226
06:18:25 openstackgerrit Michael Still proposed openstack/nova master: Move set_vf_interface_vlan to be with its only caller. https://review.openstack.org/624229
06:18:25 openstackgerrit Michael Still proposed openstack/nova master: Move create_tap_dev into privsep. https://review.openstack.org/624228
06:18:26 openstackgerrit Michael Still proposed openstack/nova master: Convert additional IP management calls to privsep. https://review.openstack.org/624231
06:18:26 openstackgerrit Michael Still proposed openstack/nova master: Move DHCP releasing to privsep. https://review.openstack.org/624230
06:18:27 openstackgerrit Michael Still proposed openstack/nova master: Move additional IP address management to privsep. https://review.openstack.org/624591
06:18:27 openstackgerrit Michael Still proposed openstack/nova master: Move route management to privsep. https://review.openstack.org/624232
06:18:28 openstackgerrit Michael Still proposed openstack/nova master: Move arping to privsep. https://review.openstack.org/624593
06:18:28 openstackgerrit Michael Still proposed openstack/nova master: Move slight bonkers IP management to privsep. https://review.openstack.org/624592
06:18:29 openstackgerrit Michael Still proposed openstack/nova master: Privsepify ipv4 forwarding enablement. https://review.openstack.org/635431
06:18:29 openstackgerrit Michael Still proposed openstack/nova master: Move cleaning conntrack to privsep. https://review.openstack.org/624594
06:18:30 openstackgerrit Michael Still proposed openstack/nova master: Move FP device creation and deletion to privsep. https://review.openstack.org/635433
06:18:30 openstackgerrit Michael Still proposed openstack/nova master: Move killing processes to privsep. https://review.openstack.org/635432
06:18:31 openstackgerrit Michael Still proposed openstack/nova master: Privsep the ebtables modification code. https://review.openstack.org/635435
06:18:31 openstackgerrit Michael Still proposed openstack/nova master: Cleanup the exec_ebtables code a little. https://review.openstack.org/635434
06:18:32 openstackgerrit Michael Still proposed openstack/nova master: Move adding vlans to interfaces to privsep. https://review.openstack.org/635436
06:44:20 openstackgerrit garyk proposed openstack/nova master: Better handle live migration abort https://review.openstack.org/635440

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