[OpenIndiana-discuss] Low low end server

[John Ryan]

On 9/02/2014 2:37 PM, Brogyányi József wrote:
> Volker
>
> I'd like to give you some suggestions.
> First the "zpool list -v" is useless code if you want to know the free 
> space. You try this:zfs list. You can see the real space on your server.
I assume your experience is with raidz configurations, where a raidz1 
made of 4 x 3Tbyte disks would show around 10.9Tb.
I don't know the reason for this, but it is well known that the |zpool| 
command counts the disks that are being used for redundancy as space, 
while the |zfs| command does not.
However, mirrored configurations report the usable size correctly, so 
5.44Tb is the correct size here.
> Another useless thing is when you sliced your SSD and put on 
> rpool,cache,log.
> If you want to increase your performance use standalone SSD for log 
> and another for cache.
What is your reasoning for this?
If the rpool is not being accessed very often, why not share the disk's 
resource? - SSDs are excellent for random I/O.
I have the same setup as this on several machines, and the performance 
is fine. I also need to do it because I don't have spare slots.
> My experience is about rpool not sensitive for the drive speed. I use 
> a very slow disk for rpool and I've not notice any server performance 
> decrease.
> But I have to say the booting time is slow and when I want to login 
> that is not very comfortable.
> This slow things not effect any running service and copy speed from RAID.
> These was a beginner experiences.
> Have nice day.
>
> Regards
> Brogyi
>
> 2014.02.07. 18:20 keltezéssel, Volker A. Brandt írta:
>>> I looked at a HP N54L today: Costs nothing, but actually handles ECC
>>> memory. Albeit very slow memory, and not very much.
>>>
>>> So, would it be reasonable to set this guy up with 4 2TB SATA disks,
>>> 8GB 800MHz ECC memory and run some Illumos based version with ZFS.
>> Yes.  Note that you could also put in 2x 8GB = 16 GB.  I am not
>> really sure what you mean by "very slow".  I use Kingston PC3-10600
>> CL9 ECC 8 GB DIMMs.
>>
>>> I was thinking of putting two 2.5" small boot disks (300GB???) using
>>> some adapter in the optical drive slot, and 4 2TB disks in a raidz
>>> to provide 6TB of storage with medium availability performance.
>> Do you really need the mirrored boot?
>>
>>> Would this work??
>> Yes, altough you would have to find a sixth SATA connector for
>> the second small boot disk, or you would have to loop the eSATA
>> port back inside the case.
>>
>>> Would the performance be good enough to be a home
>>> cloud server for media and/or documents?
>> Yes.
>>
>>> Is Nexenta or OmniOS or SMARTOS better or easier to deply than
>>> OpenIndiana for this setup?
>> I am using OmniOS, with a 128 GB Samsung SSD as boot and cache, and
>> four 3TB disks in the four slots:
>>
>> <nfs:/tmp,1597> cat /etc/release
>>    OmniOS v11 r151006
>>    Copyright 2012-2013 OmniTI Computer Consulting, Inc. All rights 
>> reserved.
>>    Use is subject to license terms.
>> <nfs:/tmp,1598> zpool list -v
>> NAME         SIZE  ALLOC   FREE  EXPANDSZ    CAP  DEDUP  HEALTH ALTROOT
>> dpool       5.44T  2.67T  2.77T         -    49%  1.00x  ONLINE -
>>    mirror    2.72T  1.33T  1.39T         -
>>      c1t0d0      -      -      -         -
>>      c1t2d0      -      -      -         -
>>    mirror    2.72T  1.33T  1.39T         -
>>      c1t1d0      -      -      -         -
>>      c1t3d0      -      -      -         -
>> cache           -      -      -      -      -      -
>>    c1t5d0s6  87.1G  3.36M  87.1G         -
>> rpool         32G  8.87G  23.1G         -    27%  1.00x  ONLINE -
>>    c1t5d0s0    32G  8.87G  23.1G         -
>>
>>
>> Easy to deploy (except the "slice the SSD up into rpool and cache"
>> bit). Works very well.
>>
>>
>> Regards -- Volker
>
>
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