Search results

There are also bug reports: https://bugzilla.proxmox.com/show_bug.cgi?id=146 https://bugzilla.proxmox.com/show_bug.cgi?id=438

Hello, I've got to the unusual issue. If my VM with Windows XP or 2003 installed has two virtio drives with IDs 0 and 1, i.e. virtio0 and virtio1, then it hangs on boot, on Windows XP/2003 boot logo. In other cases it boots well, for example: virtio0, virtio1 - hangs virtio0, virtio2 - boots...

Hello all, I wonder why I can see a lot of questions related to HA on this forum. I my experience: 1) hardware fails rarely 2) HA has to be configured properly and tested carefully 3) HA need to be tested from time to time to be sure it works 4) if you have too many machines in HA mode you can...

What cache mode is used for VM drive? Default is cache=none. Try on both (host and VM): dd if=/dev/zero of=/some/dir/testfile bs=1M count=1000 dd if=/dev/zero of=/some/dir/testfile bs=1M count=1000 oflag=direct Also try on VM (need to create a spare virtual drive): dd if=/dev/zero of=/dev/vdX...

Also you didn't mention guest file system and how did you test performance.

Is this hardware raid? Model?

What kind of RAID is used? Is this hardware/software RAID?

More information is needed. What kind of RAID is used? VM OS? VM drive configuration?

It is possible to use different modes for different virtual drives so we can move swap to another drive. Could you share your benchmark results?

1. You asked about configuration when we have a single HDD without RAID, so I suggested. 2. Any modes except directsync and writethrough shouldn't be used if we can't be sure that upper layer wouldn't try to submit new date before old data is committed. So ext4 with barriers enabled will work...

Cesar, Sorry, I didn't get your point. What is the question? Best regards, Stanislav

I suppose the best option here is writeback with barriers. So, if my VM was Linux I would create one virtual HDD with ext4 (barriers are enabled by default) and another HDD with swap partition. The first HDD can be attached with cache=writeback and the second one must be attached with...

> A) if that you say is correct, why when i do the things in this order the VM start more faster? I'm not sure if it is tunable. > B) Why I don't get to have OOS in DRDB when the verification of replicated volumes to finished? (this test is run a time for week automatically) Depends on OS...

Hi Cesar, "write_cache_state = 1" is not related to block cache. As i mentioned before this is a filter cache. This is assumed to be disabled in order to avoild posibility of two hosts trying to manage volume information concurently. Let's say you try to create volumes on both nodes at the same...

Hello cesarpk, > May be that i don't have problems of "Out of Sync" DRBD due to that i have disabled the write cache in my VMs and in my lvm.conf file of my PVE Host. There is no option in lvm.conf to enable or disable write cache. > What is the difference between "cache=writethrough" and...

Generally writethrough should be faster as it utilizes host memory for read cache. BTW: How often do you run verify?

e100, this rarely happens for Windows in my experience. My hardware are two nodes Dell R710.

I won't make any comments on the points I already mentioned. The only one I would like to add a note about is cache=none "none" means "avoid host cache", however it still doesn't wait for commit from hardware level and can change buffers while data is not completely committed. From man...

> Please run in the PVE Host: $ man lvm.conf | grep write_cache write_cache_state — Set to 0 to disable the writing out of the persistent filter cache file when lvm exits. Defaults to 1. > 1- Do you have the latest version of your firmware for the NICs and for the RAID controller installled...

> Please see in your Host PVE the file /etc/lvm/lvm.conf (the part of write cache) Could you be more specific? I don't see anything regarding write cache in lvm.conf. There is only an option related to filter scan cache (i.e. /etc/lvm/.cache). > And the verification of DRBD is a comparison of...