Re: [zfs-discuss] does sharing an SSD as slog and l2arc reduces its life span?

2010-06-19 Thread Richard Jahnel
Well pretty much by definition any writes shorten the drives life, the more writes the shorter it is. That said, here is some interesting math that I did before I built my first mlc array. For a certain brand of indellix drive I calculated the life span in the following way. Based on the maxim

Re: [zfs-discuss] does sharing an SSD as slog and l2arc reduces its life span?

2010-06-19 Thread Bob Friesenhahn
On Sat, 19 Jun 2010, Arne Jansen wrote: If the ZIL is heavily used, the same 10% of the device get written over and over again, reducing the life span by 90%. The SSD design might implement wear leveling which moves an old block which was only written once or twice to the block with heavy wear

[zfs-discuss] OpenSVC now support ZFS as a sync resource.

2010-06-19 Thread galibern
Dear Community, OpenSVC now support ZFS as a sync resource. So it is possible to have ZFS reliable synchronization of datasets/zonepaths between different nodes of an OpenSVC service. OpenSVC is a GPLv2 project automating the low-level operations needed 1/ to bring up system resources :

Re: [zfs-discuss] ZFS pool - label missing on invalid

2010-06-19 Thread Cott Lang
> On 6/18/10 11:25 PM -0700 Cott Lang wrote: > > 'zpool detach' clears the information from the disk > that zfs needs to > reimport the disk. If you have a late enough version > of opensolaris > you should instead run 'zpool split'. Otherwise, > shut down as normal > (ie, don't tell zfs you are

[zfs-discuss] does sharing an SSD as slog and l2arc reduces its life span?

2010-06-19 Thread Arne Jansen
Hi, I don't know if it's already been discussed here, but while thinking about using the OCZ Vertex 2 Pro SSD (which according to spec page has supercaps built in) as a shared slog and L2ARC device it stroke me that this might not be a such a good idea. Because this SSD is MLC based, write cycles