Re: [zfs-discuss] RFE: Un-dedup for unique blocks

2013-01-22 Thread Michel Jansens 


Maybe 'shadow migration' ?  (eg: zfs create -o shadow=nfs://server/dir  
pool/newfs)


Michel


On 01/21/13 17:03, Sašo Kiselkov wrote:

Again, what significant features did they add besides encryption? I'm
not saying they didn't, I'm just not aware of that many.


Just a few examples:

Solaris ZFS already has support for 1MB block size.

Support for SCSI UNMAP - both issuing it and honoring it when it is  
the backing store of an iSCSI target.


It also has a lot of performance improvements and general bug fixes  
in the Solaris 11.1 release.


--
Darren J Moffat
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Michel Jansens
mjans...@ulb.ac.be



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[zfs-discuss] SSD ZIL/L2ARC partitioning

2012-11-14 Thread Michel Jansens 

Hi,

I've ordered a new server with:
- 4x600GB Toshiba 10K SAS2 Disks
- 2x100GB OCZ DENEVA 2R SYNC eMLC SATA (no expander so I hope no SAS/ 
SATA problems). Specs: http://www.oczenterprise.com/ssd-products/deneva-2-r-sata-6g-2.5-emlc.html


I want to use the 2 OCZ SSDs as mirrored intent log devices, but as  
the intent log needs quite a small amount of the disks (10GB?), I was  
wondering if I can use the rest of the disks as L2ARC?


I have a few questions about this:

-Is 10GB enough for a log device?
-Can I partition the disks (10GB + 90 GB) and use the unused (90GB)  
space as L2ARC?
-If I use the rest of the disks as L2ARC, do I have to mirror the  
L2ARC or can I just add 2 partitions (eg: 2 x 90GB = 180GB)
-If I used non mirrored L2ARC, Could something go wrong if one L2ARC  
device failed (pool unavailable,lock in the kernel, panic,...)?




--
Michel Jansens

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