zfs discuss - May 2010 - First Setup

Hi!  We''re building our first dedicated ZFS-based NAS/SAN (probably
using Nexenta) and I''d like to run the specs by you all to see if you
have any recommendations.  All of it is already bought, but it''s not
too late to add to it.
Dell PowerEdge R9102x Intel X7550 2GHz, 8 cores each plus HyperThreading256GB
RAM2x 4GB DDRDrive X1 (PCIe) in mirror for the ZIL8x 100GB Samsung SS805 SSDs
for the L2ARC (on an onboard PERC H700 controller)2x PERC H800 and 2x PERC6
controllers for the JBODs below11x Dell MD1000 JBODs with:     45x 750GB SATA
HDDs     30x 1000GB SATA HDDs     60X 300GB SAS 15K HDDs     30x 600GB SAS 15K
HDDs2x 10GbE ports
We plan to connect about 30 servers to it.  About 8 will be currently I/O-bound
MySQL databases with a 60/40 read bias, the rest will have much lighter usage. 
Most connections will be through iSCSI.
Is there anything that seems out of proportion?  Where do you think the
bottleneck will be?  If I''m going to use the SAS 15K drives for
databases and the SATA drives for NFS/backups, how should I setup the pools?
Thank you for any advice!
 		 	   		  
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----- "Ian D" <reward72 at hotmail.com> skrev: 


Hi! We''re building our first dedicated ZFS-based NAS/SAN (probably
using Nexenta) and I''d like to run the specs by you all to see if you
have any recommendations. All of it is already bought, but it''s not too
late to add to it.


Dell PowerEdge R910 
2x Intel X7550 2GHz, 8 cores each plus HyperThreading 
256GB RAM 
2x 4GB DDRDrive X1 (PCIe) in mirror for the ZIL 
8x 100GB Samsung SS805 SSDs for the L2ARC (on an onboard PERC H700 controller) 
2x PERC H800 and 2x PERC6 controllers for the JBODs below 
11x Dell MD1000 JBODs with: 
45x 750GB SATA HDDs 
30x 1000GB SATA HDDs 
60X 300GB SAS 15K HDDs 
30x 600GB SAS 15K HDDs 
2x 10GbE ports 


We plan to connect about 30 servers to it. About 8 will be currently I/O-bound
MySQL databases with a 60/40 read bias, the rest will have much lighter usage.
Most connections will be through iSCSI.


Is there anything that seems out of proportion? Where do you think the
bottleneck will be? If I''m going to use the SAS 15K drives for
databases and the SATA drives for NFS/backups, how should I setup the pools?
For the DB pools, I''d say use RAID10. For the backup areas, RAIDz2
groups with something like 8-10 drives in each should be ok. For high write, 4GB
ZIL might be a little low, and you have probably way too much CPU for just
NAS/SAN. Remember to leave a few disks for spares (1-2 of each size?). Apart
from that, it looks like you may save some rack space by getting new (consumer)
2TB drives, but that''s your choice :)

Best regards 

roy 
-- 
Roy Sigurd Karlsbakk 
(+47) 97542685 
roy at karlsbakk.net 
http://blogg.karlsbakk.net/ 
-- 
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er
et element?rt imperativ for alle pedagoger ? unng? eksessiv anvendelse av
idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og
relevante synonymer p? norsk.
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