[pve-devel] Default cache mode for VM hard drives

Stanislav German-Evtushenko ginermail at gmail.com
Mon Apr 13 20:11:25 CEST 2015


Hello Cesar,

If you don't have this problem I do not really understand why cut in any
try to convince everybody that the problem does not exist.

Regards,
Stanislav

On Apr 13, 2015 8:46 PM, "Cesar Peschiera" <brain at click.com.py> wrote:
>
> Hi Stanislav
>
> Excuse me please, but your link don't tell me nothing about of the root
of the problem of "oos" in DRBD (assuming that the directive
"data-integrity-alg" is disabled).
>
> Also, i have configured in the lvm.conf file "write_cache_state = 0" (may
be this can help you, that is other recomendation of Linbit)
>
> I think that the tuning of DRBD is the key for the success, that i did in
workstations and real servers, and never had problems of "oos", always with
all firmwares of hardware updated and with NICs Intel of 1 Gb/s or 10 Gb/s
with bonding balance-rr exclusive for replication of DRBD (NIC-to-NIC, and
i don't know if will work well with the broadcom brand or with other
brands, I never did a test).
>
> In real servers, with I/OAT engine enabled in the BIOS, and with Intel
NICs, you get better performance (and in my case, without get  a "oos")
>
> Best regards
> Cesar
>
> ----- Original Message ----- From: Stanislav German-Evtushenko
> To: Cesar Peschiera
> Cc: Alexandre DERUMIER ; pve-devel
> Sent: Monday, April 13, 2015 12:12 PM
>
> Subject: Re: [pve-devel] Default cache mode for VM hard drives
>
>
> Hi Cesar,
>
>
> Out of sync with cache=directsync happen in very specific cases. Here is
the decription of one of them:
http://forum.proxmox.com/threads/18259-KVM-on-top-of-DRBD-and-out-of-sync-long-term-investigation-results?p=108099#post108099
>
>
> Best regards,
>
> Stanislav
>
>
>
>
> On Mon, Apr 13, 2015 at 7:02 PM, Cesar Peschiera <brain at click.com.py>
wrote:
>
> Hi to all
>
> I use directsync in my VMs with DRBD 8.4.5 in four nodes (LVM on top of
DRBD), since some months ago, never did have problems (all sunday days, a
automated system verify all storages DRBD),
>
> These are the version of packages of my PVE nodes:
>
> In a pair of nodes:
> Shell# pveversion -v
> proxmox-ve-2.6.32: 3.3-139 (running kernel: 3.10.0-5-pve)
> pve-manager: 3.3-5 (running version: 3.3-5/bfebec03)
> pve-kernel-2.6.32-27-pve: 2.6.32-121
> pve-kernel-3.10.0-5-pve: 3.10.0-19
> pve-kernel-2.6.32-28-pve: 2.6.32-124
> pve-kernel-2.6.32-29-pve: 2.6.32-126
> pve-kernel-2.6.32-34-pve: 2.6.32-139
> lvm2: 2.02.98-pve4
> clvm: 2.02.98-pve4
> corosync-pve: 1.4.7-1
> openais-pve: 1.1.4-3
> libqb0: 0.11.1-2
> redhat-cluster-pve: 3.2.0-2
> resource-agents-pve: 3.9.2-4
> fence-agents-pve: 4.0.10-1
> pve-cluster: 3.0-15
> qemu-server: 3.3-3
> pve-firmware: 1.1-3
> libpve-common-perl: 3.0-19
> libpve-access-control: 3.0-15
> libpve-storage-perl: 3.0-25
> pve-libspice-server1: 0.12.4-3
> vncterm: 1.1-8
> vzctl: 4.0-1pve6
> vzprocps: 2.0.11-2
> vzquota: 3.1-2
> pve-qemu-kvm: 2.1-10
> ksm-control-daemon: 1.1-1
> glusterfs-client: 3.5.2-1
>
> In other pair of nodes:
> Shell# pveversion -v
> proxmox-ve-2.6.32: 3.3-139 (running kernel: 3.10.0-5-pve)
> pve-manager: 3.3-5 (running version: 3.3-5/bfebec03)
> pve-kernel-3.10.0-5-pve: 3.10.0-19
> pve-kernel-2.6.32-34-pve: 2.6.32-139
> lvm2: 2.02.98-pve4
> clvm: 2.02.98-pve4
> corosync-pve: 1.4.7-1
> openais-pve: 1.1.4-3
> libqb0: 0.11.1-2
> redhat-cluster-pve: 3.2.0-2
> resource-agents-pve: 3.9.2-4
> fence-agents-pve: 4.0.10-1
> pve-cluster: 3.0-15
> qemu-server: 3.3-5 <-particularly made by Alexandre
> pve-firmware: 1.1-3
> libpve-common-perl: 3.0-19
> libpve-access-control: 3.0-15
> libpve-storage-perl: 3.0-25
> pve-libspice-server1: 0.12.4-3
> vncterm: 1.1-8
> vzctl: 4.0-1pve6
> vzprocps: 2.0.11-2
> vzquota: 3.1-2
> pve-qemu-kvm: 2.2-2 <-particularly made by Alexandre
> ksm-control-daemon: 1.1-1
> glusterfs-client: 3.5.2-1
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