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Re: KVM + LVM + DRBD + SSD low performance : SOLVED!!! Hi Firstly, thanks so much to all that have lost time to review this post (mir, spirit and LnxBil)! Finally, as I don't found the solution of problem (bad performance in proxmox3.4 but good in proxmox4) and don't want for now upgrade all...

Ok, thanks a lot! hope that someone of proxmox team can review this point.

Thanks LnxBil for your answer. Well, for now, it's not seem an problem of network or an issue of DRBD, but some problem with proxmox3. In my test of yesterday, I install 2 standalone server (same hardware, withoud cluster, without drbd), one with proxmox3, the other with proxmox4 beta, in both...

Hi Mir I have obtain an very good result by changing /sys/class/scsi_disk/0\:0\:0\:0/cache_type parameter on beta proxmox4 node, same change on proxmox3.4 have no effect, do you know why or what have changed into proxmox4 to have this result? Is correct to put "write through" in...

Continue with searching information, I found http://www.theirek.com/blog/2014/02/16/patch-dlia-raboty-s-enierghoniezavisimym-keshiem-ssd-diskov (from http://forum.proxmox.com/archive/index.php/t-18002.html post).... I just try echo temporary write through >...

I have read now, but I don't see the direct relation about problem SSD / LVM... Is there any special point to review in this links that can helpme to solve the problem LVM/SSD? For configure drdb I use proxmox doc, but for now, the problem is before the drbd... Mir, thanks to still answered...

I'm still testing : It seem the problem is directly with LVM volume (Now I don't know if the problem is also with DRBD)... I have try VM on new host without any DRBD, with one VM over local disk, and other same VM in same node, over LVM mounted on pve. The first have correct data....the...

I have use the fio comand that you say in other post : Without DRBD With DRBD

Hi mir, sorry, I have very few experience about test as dd or fio, I join you what you say (VM with 2G of RAM => file of 4G), dd with oflag=direct Without DRBD # dd if=/dev/zero of=/var/testfile bs=1M count=4000 oflag=dir ect 4000+0 records in 4000+0 records out 4194304000 bytes (4,2 GB)...

2,5 GB/sec... what a dream!!! :D Well I have no budget for such hardware, but I am trying our same server with proxmox4, I have try to create an DRBD9 on 3 clusters node but have no success (when I try to connect other node Error: I/O error while accessing persistent configuration storage)...

Spirit, I have seen an post that talk about Iothreads that is include now in proxmox4, I have read that is similar as x-data-plane, is this can help to resolve our ssd performance?

Hi firstly, thanks a lot to review our problem! We have correctly VIRTIO and 'Write Through' in the configuration. I have tried 'Direct Sync' but no better result with it. All server are connected with an 2,5G switch, so it's not muy probably that is the problem. I have deploy an VM on...

Hi I know that there is a lot of post of this in the forum, but I test lot of things and have no successful result on my server. I use 8 small servers (Atom c2750 with 8G RAM DDR· and 1 hdd SSD 256G crucial MX100) in an proxmox cluster (version 3.4). All servers are connected to other server to...