one nas two servers - how best to make proxmox failover cluster?

offerlam

Renowned Member
Dec 30, 2012
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Denmark
Hi all

I have a:

Synology DS 1513+

and 2 servers ...

How do i best make a cluster?

I was planing in the begning of just using ISCSI but than i learned that that would mean i couldn't do backups...

than i figured NFS but that doesn't seem to be supported..?

I have heard about something with a 3 node cluster where you could do some ISCI or NFS?

all in all my impression is that making a proxmox failover cluster with only one nas and two nodes is vary hard?

PLEASE set me streight???

my proxmox version is 3.1-3/dc0e9b0e

Thanks

Casper
 
In principle your setup is "sufficient". Create a small partition on the synology which you make available for the proxmox nodes through iSCSI to be us as quorum disk. The rest of the space on the synology should then be used for shared storage for the proxmox nodes either through iSCSI or through NFS. To have reasonable performance you should go for RAID10 (4+2/3 TB disks) will give 4-6 TB storage. I will recommend either WD Red WD20EFRX 2 TB or WD Red WD30EFRX 3 TB.
 
Hi Mir,

What if i have 3 nodes? would I than need a qurom storage? and if not how would that work?

you mention using ISCSI for shared storage.. i was told you can't backup using proxmox over iscsi?

we are going for WD4000F9YZ in a 3 disk raid 5 config for the moment its all we can afford.. would that be bad or?

Thanks for answering

Casper
 
If you have 3 nodes there is no need for a quorum disk.

Backup needs to be stored on a file system so if you want to place backup on your Synology you should make NFS available also or you could place backups on an external USB disk.

WD4000F9YZ looks fine but raid 5 is not god for iops. For a 3 disk raid 5 don't expect to see iops numbers more than half of what one disk is capable of (200-300).
 
the math I did showed that even with a raid 5 i have enough IOPs to give at least 100Mbs over ISCSI - this was judged from the performance specs of the ds1513+ from the synology website - do you agree? I may be wrong :)

I'm getting two DS1513+ so im thinking doing backup on one using NFS and doing shared storage on the other using ISCSI... can i use NFS as shared storage?

on a side note

I don't see that proxmox can do retention when it comes to backup... in other words if i have a daily backup running it will override the data from yestoday instead of making an new image... do you know a best practise to overcome this?

Thanks

Casper
 
the math I did showed that even with a raid 5 i have enough IOPs to give at least 100Mbs over ISCSI - this was judged from the performance specs of the ds1513+ from the synology website - do you agree? I may be wrong :)
IOPS and throughput are two different things. Throughput measures the amount of sequential data which can be transferred (like a file server) while IOPS measures the IO operations per second which is mostly related to random reads and writes (like an application server - database, web server, mail server etc).
I'm getting two DS1513+ so im thinking doing backup on one using NFS and doing shared storage on the other using ISCSI... can i use NFS as shared storage?
NFS is perfectly valid for shared storage.
on a side note

I don't see that proxmox can do retention when it comes to backup... in other words if i have a daily backup running it will override the data from yestoday instead of making an new image... do you know a best practise to overcome this?
The storage wizard has an option 'Max Backups'. This number configures how many backups are kept on the storage. I.e. 'Max Backups' = 3 means keep the latest backup as well as the last two backups.
 
Hi Mir and sorry for not making any since

according to this article they messured a 3 farm terminal server windows 2008 r2 to use 200 iops for 50 users.. using that as a base i figured a raid 5 with 3 disc would be able to deliver this.. im not so sure though now when i read this article

http://www.storagereview.com/wd_se_hdd_review

what do you think? would i perhaps need more disc in my raid 5 to gain 200 iops?

what would you use? ISCSI or NFS? im asking you not the community cause i know this is mostly religion :)

And thanks for explaning the retention stuff :)

Thanks

Casper
 

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