[PVE-User] LVM over ISCSI Bad performance

Michael Rasmussen mir at miras.org
Tue Jun 21 19:48:47 CEST 2016

Hash: SHA512

Multipath must be manually configured via CLI.

On June 21, 2016 7:44:39 PM GMT+02:00, Harald Leithner <leithner at itronic.at> wrote:
>Hi again^^,
>I miss interpreted the benchmark result, with writeback cache is 5500
>MB/s so thats ok... with direct IO it gets about 100 MB/s
>But I have still no clue how I could use multipath with proxmox web
>Am 21.06.2016 um 19:15 schrieb Harald Leithner:
>> Hi,
>> I have a MSA2312 connected with 1gbit to a 3 node PVE 4.2 Cluster.
>> I managed to get ISCSI and LVM working and attached it to a VM.
>> Atm I didn't manage to get multipath working with PVE because the
>> Wikipage tells me how to create multipath (which works) but not how
>> uses it for LVM VGs... maybe someone give me a hint.
>> Anyway the main problem is that fio only gives me a read performance
>> 5 mb/s if I attach a disk as virtio or scsi device with cache
>> If I attach the same SAN Drive directly in the VM with iSCSI (with
>> without multipath) I get about 112 MB/s.
>> I also get this speed on the pve host.
>> I use:
>> fio --filename=/dev/sdb --direct=1 --rw=read --bs=1m --size=20G
>> --numjobs=200 --runtime=60 --group_reporting --name=file1
>> for benchmarking.
>> While benchmarking the VM I see 1300% cpu usage on the host (mainly
>> time)
>> Maybe someone has a idea?
>> regards
>Harald Leithner
>Wiedner Hauptstraße 120/5.1, 1050 Wien, Austria
>Tel: +43-1-545 0 604
>Mobil: +43-699-123 78 4 78
>Mail: leithner at itronic.at | itronic.at
>pve-user mailing list
>pve-user at pve.proxmox.com

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