Re: [zfs-discuss] SLOG striping? (Bob Friesenhahn)

2010-06-22 Thread Ross Walker
On Jun 22, 2010, at 8:40 AM, Jeff Bacon wrote: >> The term 'stripe' has been so outrageously severely abused in this >> forum that it is impossible to know what someone is talking about when >> they use the term. Seemingly intelligent people continue to use wrong >> terminology because they thin

Re: [zfs-discuss] SLOG striping? (Bob Friesenhahn)

2010-06-22 Thread Jeff Bacon
> The term 'stripe' has been so outrageously severely abused in this > forum that it is impossible to know what someone is talking about when > they use the term. Seemingly intelligent people continue to use wrong > terminology because they think that protracting the confusion somehow > helps new

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Bob Friesenhahn
On Mon, 21 Jun 2010, Edward Ned Harvey wrote: log and cache devices don't stripe. You can add more than one, and The term 'stripe' has been so outrageously severely abused in this forum that it is impossible to know what someone is talking about when they use the term. Seemingly intelligen

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Richard Elling
On Jun 21, 2010, at 11:17 AM, Arne Jansen wrote: > Roy Sigurd Karlsbakk wrote: >> Hi all >> I plan to setup a new system with four Crucial RealSSD 256MB SSDs for both >> SLOG and L2ARC. The plan is to use four small slices for the SLOG, striping >> two mirrors. I have seen questions in here abou

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Edward Ned Harvey
> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of Roy Sigurd Karlsbakk > > I plan to setup a new system with four Crucial RealSSD 256MB SSDs for > both SLOG and L2ARC. The plan is to use four small slices for the SLOG, > striping two mirrors.

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Arne Jansen
Roy Sigurd Karlsbakk wrote: - mirroring l2arc won't gain anything, as it doesn't contain any information that cannot be rebuilt if a device is lost. Further, if a device is lost, the system just uses the remaining devices. So I wouldn't waste any space mirroring l2arc, I'll just stripe them. I

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Brandon High
On Mon, Jun 21, 2010 at 11:24 AM, Roy Sigurd Karlsbakk wrote: > Any idea if something like a small, decently priced, supercapped SLC SSD > exist? The new OCZ Deneva drives (or others based on the SF-1500) should work well, but I don't know if there's pricing available yet. -B -- Brandon High

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Roy Sigurd Karlsbakk
> - mirroring l2arc won't gain anything, as it doesn't contain any > information that cannot be rebuilt if a device is lost. Further, if a > device is lost, > the system just uses the remaining devices. So I wouldn't waste any > space mirroring l2arc, I'll just stripe them. I don't plan to attempt

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Arne Jansen
Roy Sigurd Karlsbakk wrote: Hi all I plan to setup a new system with four Crucial RealSSD 256MB SSDs for both SLOG and L2ARC. The plan is to use four small slices for the SLOG, striping two mirrors. I have seen questions in here about the theoretical benefit of doing this, but I haven't seen

Re: [zfs-discuss] SLOG striping?

2010-06-21 Thread Bob Friesenhahn
On Mon, 21 Jun 2010, Roy Sigurd Karlsbakk wrote: I plan to setup a new system with four Crucial RealSSD 256MB SSDs for both SLOG and L2ARC. The plan is to use four small slices for the SLOG, striping two mirrors. I have seen questions in here about the theoretical benefit of doing this, but I

[zfs-discuss] SLOG striping?

2010-06-21 Thread Roy Sigurd Karlsbakk
Hi all I plan to setup a new system with four Crucial RealSSD 256MB SSDs for both SLOG and L2ARC. The plan is to use four small slices for the SLOG, striping two mirrors. I have seen questions in here about the theoretical benefit of doing this, but I haven't seen any answers, just some doubt a