Hi Ben,
First of all thank you for quick feedback, and some more questions pop in
my mind :)
* the ssd drive will only help in write I/O's ? i ask this because we
will need to backup this data to another host running solaris attached with
fibre to a tape library. our current setup takes around 10 hours for a full
backup (!!), and my intention is to decrease this backup time window
* will the atime defined as off will help to maximize performance ?
* is there any rule of thumb to setup the recordsize, or any real word
experience ,something like ZFS in the Trenches ? ;)
* more "exotic" features of ZFS like file prefetch, device
prefecth..any advise on those?
Thank you,
Bruno Sousa
On Wed, 22 Apr 2009 12:48:27 -0700, Ben Rockwood <[email protected]>
wrote:
> bsousa wrote:
>>
>> Greetings to all !
>>
>> I'm quite new in this opensolaris/zfs world, but it seems like this a
>> very nice piece of software and i would like to have some advise from
>> people that now what they say/do.
>> With this in mind i have a system with :
>>
>> * SUN X2200 with 2xdual core AMD cpu's with 12GB attached to a
>> SATA chassis acting like a JOBD (no raid card here, only a LSI
>> HBA to connect SAS cable)
>> * 12 SATA 1TB Seagate Barracuda with 32mb cache
>> * opensolaris 5.11 snv_101b
>>
>> Our current storage it's a Sun Storedge 5210 with a 5 disks (10k scsi)
>> in a Raid 5 layout.I want to see if Opensolaris+ZFS+commodity hardware
>> can deliver better performance for a Sun Java Communications Suite
>> mailstore,i assume it will have random small read/write I/Os, with a
>> size of 400GB.
>> The SUN 5210 it's mounted to the mailserver by NFS v3, and this new
>> storage will be made available to the mailserver using NFS v3 as well.
>> Regarding the zpool layout, my question is :
>>
>> * what's the best configuration for performance, specially in
>> reading from storage
>>
>> I think that a mirror would deliver the best performance and giving us
>> the lowest capacity, and on the opposite we have RaidZ or RaidZ2. So
>> should i create a zpool with 3 sets of 2 disks mirrored, a raidz with
>> 6 disks, or 1 zpool with 2 raidz sets on it?
>>
>
> Your right on in your thinking. Mirror'ed pairs are going to maximize
> your performance and should be the preference.
>
> Giving up so much capacity to mirrored pairs is painful, but not nearly
> as painful as having a lot of capacity that is really slow.
>
> Additionally, if you have a couple spare dollars, I _highly_ suggest
> getting an SSD. Use one slot for SSD ZIL (ZFS Intent Log, think of it
> as a write cache). The SSD for ZIL will _significantly_ improve your
> write performance, especially for NFS and mail. It will well be worth
> the $500 or so.
>
> benr.
>
>
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