Bad disk I/O

[vrturbo]

Hi Guys,

First post here so please go easy on me.

I'm having disk I/O issues and I'm going to get my data centre to install a hardware raid controller on my server. Which cards do you guys recommend so I know whats best to ask for etc.. ?

Also I plan to run RAID0 so should I be running just the two disks or should I be asking for 3 X 1TB or 4 X 750GB or will a good controller be enough ?

See server details below:

host01:~# pveperf /var/lib/vz/disk2
CPU BOGOMIPS:      42560.00
REGEX/SECOND:      850811
HD SIZE:           1375.34 GB (/dev/sdb1)
BUFFERED READS:    57.25 MB/sec
AVERAGE SEEK TIME: 36.17 ms
FSYNCS/SECOND:     130.65

host01:~# pveversion  -v
pve-manager: 1.5-5 (pve-manager/1.5/4627)
running kernel: 2.6.18-1-pve
proxmox-ve-2.6.18: 1.5-4
pve-kernel-2.6.18-1-pve: 2.6.18-4
qemu-server: 1.1-11
pve-firmware: 1.0-3
libpve-storage-perl: 1.0-7
vncterm: 0.9-2
vzctl: 3.0.23-1pve6
vzdump: 1.2-5
vzprocps: 2.0.11-1dso2
vzquota: 3.0.11-1
pve-qemu-kvm-2.6.18: 0.9.1-4

        *-storage
             description: SATA controller
             product: 82801JI (ICH10 Family) SATA AHCI Controller
             vendor: Intel Corporation
             physical id: 1f.2
             bus info: pci@0000:00:1f.2
             logical name: scsi2
             logical name: scsi3
             logical name: scsi5
             version: 00
             width: 32 bits
             clock: 66MHz
             capabilities: storage msi pm ahci_1.0 bus_master cap_list emulated
             configuration: driver=ahci latency=0 module=ahci
           *-disk:0
                description: ATA Disk
                product: ST31500341AS
                vendor: Seagate
                physical id: 0
                bus info: scsi@2:0.0.0
                logical name: /dev/sda
                version: CC1H
                serial: 9VS3PL0J
                size: 1397GiB (1500GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5
         *-disk:1
                description: ATA Disk
                product: ST31500341AS
                vendor: Seagate
                physical id: 1
                bus info: scsi@3:0.0.0
                logical name: /dev/sdb
                version: CC1H
                serial: 9VS3PRKY
                size: 1397GiB (1500GB)
                capabilities: partitioned partitioned:dos
                configuration: ansiversion=5 signature=1c508c83

Regards, Vrturbo

 

[tom]

we got good results with Adaptec 5805Z, e.g. configure 4 x 750 GB disk in a RAID10 (you will get best read/write speed, 1.5 TB in total). but there are a lot of others. just use the search function of the forum to see more.

here is a pveperf of a Adaptec 5805Z, RAID10 with 4 x WD RE2 1 TB SATA:

pveperf

CPU BOGOMIPS:      8533.70
REGEX/SECOND:      716559
HD SIZE:           94.49 GB (/dev/mapper/pve-root)
BUFFERED READS:    336.57 MB/sec
AVERAGE SEEK TIME: 8.14 ms
FSYNCS/SECOND:     2978.67
DNS EXT:           25.79 ms
DNS INT:           0.93 ms (proxmox.com)

 

[tom]

... and update your Proxmox VE to the latest packages:

apt-get update && apt-get upgrade

 

[udo]

Hi,
i have good experiences with Areca-Raidcontroller. See http://forum.proxmox.com/threads/3000-Measure-PVE-performance?p=16800#post16800
If you only stripe the disks you will lost all data by an disk-failure. If you need very fast disks take good SAS instead of Sata disks.

Udo