[PVE-User] get the most of storage for a very old dell pe 2950.

Leandro Roggerone leandro at tecnetmza.com.ar
Tue Apr 20 14:06:21 CEST 2021


Thank you guys.
I will try to buy 6 new drives.
Then I will let you know how it goes.
Regards.
Leandro.

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El lun, 19 abr 2021 a las 17:21, Dimitri Alexandris (<d.alexandris at gmail.com>)
escribió:

> I have an old Dell 1950 with one cpu (2 disks).  Was 1+1G ram, added 16+16
> and now have 34G.  Two power supplies.
>
> 1-  Never bothered to change SAS controller mode.
> 2-  SATA disks (up to 2T of course) work perfectly, never used transposers.
> 3-  First worked with an internal SSD (at internal SATA port, plus an addon
> power cable) for OS (always ZFS) + 2 SATA disks (ZFS raid) for data.  3
> years, no problems.
> 4-  Now i bought 2 SAS 1T, with OS on them, and also works fine.
> 5-  Hot plugging disks is working fine.  I actually increased capacity with
> bigger disks without stopping anything this way.  Had 500G SATA before 1T
> SAS diks.
>
> I configure the 2 eths in OVS (openvswitch) bond mode, with several VLANS
> and internal networks (OVS IntPorts).
>
> In your case, with many SAS disks you will be fine with any configuration,
> e.g.:
>
> 3+3 x 2T = 6T ZFS raid, OS + data, the fastest combination, or
> 5+1 ZFS raidz, 10T space, with best capacity, or
> 4+2 ZFS raidz2, 8T space, also big, and safer.
>
> Do yourself a favour, and buy some decent SAS disks, at 7200rpm are very
> cheap.
>
>
> On Mon, Apr 19, 2021 at 6:08 PM Kyle Schmitt <kyleaschmitt at gmail.com>
> wrote:
>
> > I run on R610s, so about the same generation I think.  I use the
> > hardware raid for mirrored boot drive only, and NFS over 10G for VM
> > storage, which is on a seperate system running FreeBSD + ZFS.
> >
> > But for your case: the general rule for any storage system is don't
> > mix.  You pick one and only one: hardware raid, software raid, zfs,
> > ceph, etc.  The exceptions are for systems you almost definitely won't
> > be using like luster and gluster.
> >
> > You can still do hotplug with JBOD mode, at least on the dell hardware
> > I've used.  I have no idea if it's officially supported or not.  I do
> > know that I sometimes have to use the raid tools to bring in a new
> > drive when it's NOT in JBOD mode.
> >
> > In the 6ish years I've run ZFS I've only had one drive fail (pure
> > luck, not skill), and it was trivial to swap out and replace.
> >
> > --Kyle
> >
> > On Mon, Apr 19, 2021 at 7:59 AM Leandro Roggerone
> > <leandro at tecnetmza.com.ar> wrote:
> > >
> > > Hi guys , I received a very old del pe 2950 box.
> > > Fortunately it has 64 GB and a double power supply, so i'm thinking
> about
> > > using it with pve.
> > > After confirm with dell support about storage capacity:
> > > Max physical storage support is 2TB.
> > > Max virtual storage support is also 2TB.
> > > ##
> > > I was reading on previous emails at this mail list , about storage:
> > >  "putting the controller in JBOD mode
> > > and install directly with ZFS software RAID."
> > >
> > > I always thought that raid hardware controller was the best option but
> ,
> > > perhaps I can give it a try to ZFS software RAID with this old server
> > ....
> > > what do you think ?
> > > I have a bunch of 3.5" with odd capacities  unused drives.
> > > I readed that zfs can merge them to get a more efficient use.
> > > What about hot replace / remove or insert a new drive ?
> > > Will it work without service disruption in production environments ?
> > >
> > > Regards,
> > > Leandro.
> > >
> > > <
> >
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