This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] iscsi vs nfs for xen VMs

To: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] iscsi vs nfs for xen VMs
From: Christian Zoffoli <czoffoli@xxxxxxxxxxx>
Date: Wed, 26 Jan 2011 21:25:56 +0100
Cc: Freddie Cash <fjwcash@xxxxxxxxx>
Delivery-date: Wed, 26 Jan 2011 12:27:28 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <AANLkTikNzgxxeKQHZ=dAzJAXB3RSU0tQ2421K3-dADO2@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <994429490908070648s69eed40eua19efc43c3eb85a7@xxxxxxxxxxxxxx> <7bc80d500908070700s7050c766g4d1c6af2cd71ea89@xxxxxxxxxxxxxx> <994429490908070711q4c64f92au9baa6577524e5c5d@xxxxxxxxxxxxxx> <3463f63d0908070726y630d320u3e3f1f1cae9b34a4@xxxxxxxxxxxxxx> <sig.0007322cfd.AANLkTi=2S3bKf6jv9BbqYMbkWFbjJTrpYh8GK2EGXGns@xxxxxxxxxxxxxx> <4D3FD940.1090000@xxxxxxxxxxxx> <AANLkTi=J-s+oc44wY-N_wQ+wQr=VhnG-EK48QYpx7y-Y@xxxxxxxxxxxxxx> <5DB0519124BB3D4DBEEB14426D4AC7EA18BFE6FF56@xxxxxxxxxxxxxxxxxxxxx> <sig.40076de9f5.AANLkTim+T5yAfovgX2JsH9BMp3r6agxCqRxVBoG7acXT@xxxxxxxxxxxxxx> <AANLkTi=Nws9ULuk6MjoEJJJLh=zTf9yDJo5HnheX6sie@xxxxxxxxxxxxxx> <4D407E80.1050209@xxxxxxxxxxx> <AANLkTikNzgxxeKQHZ=dAzJAXB3RSU0tQ2421K3-dADO2@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110105 Lightning/1.0b2 Thunderbird/3.1.7
Il 26/01/2011 21:15, Freddie Cash ha scritto:
> For ZFS?  No, there are no guarantees.  But the Illumos, Nexenta, and
> FreeBSD devs won't be sitting still just waiting for Oracle to release
> something (look at the removal of the python dependency ZFS
> delegations in Illumos, for example).  This may lead to a split in the
> future (Oracle ZFS vs OpenZFS).  But that's the future.  ZFSv28 is
> available for FreeBSD right now, which supports all the features we're
> looking for in ZFS.

I'm hoping like you ...because ZFS is a great FS ...a bit memory hungry
but great

>> d) NFS is slow ...NFS over RDMA is fast but freebsd has no open/official
>> infiniband stack
> NFS doesn't have to be slow.

in other words if your car can go at 300 Km/h ...with NFS you have a
maximum of 180/200 ...

> Yes, true.  But having a cronjob in the guest (or having the backups
> server execute the command remotely) that does a dump of the database
> before the backup snapshot is created is pretty darn close to atomic,
> and hasn't failed us yet in our restores.  It's not perfect, but so
> far, so good.

of course

> Compared to the hassle of getting iSCSI live-migration working, and
> all the hassles of getting a cluster-aware LVM or FS setup, I'll take
> a little drop in raw disk I/O.  :)  Ease of management trumps raw
> performance for us (we're only 5 people managing servers for an entire
> school district of ~2100 staff and 50 schools).

not so difficult to setup ...I prefer to not waste money in additional
storages and I prefer also to consolidate more VMs on a single storage.


Xen-users mailing list