[zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Mark Wolek
Still kicking around this idea and didn't see it addressed in any of the threads before the forum closed. If one made an all ssd pool, would a log/cache drive just slow you down? Would zil slow you down? Thinking rotate MLC drives with sandforce controllers every few years to avoid losing a

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Ian Collins
On 10/28/11 07:04 PM, Mark Wolek wrote: Still kicking around this idea and didn’t see it addressed in any of the threads before the forum closed. If one made an all ssd pool, would a log/cache drive just slow you down? Would zil slow you down? I would guess not, you would still be

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Neil Perrin
On 10/28/11 00:04, Mark Wolek wrote: Still kicking around this idea and didnt see it addressed in any of the threads before the forum closed. If one made an all ssd pool, would a log/cache drive just slow you down? Would zil slow you down? Thinking rotate MLC drives with

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Edward Ned Harvey
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Mark Wolek Still kicking around this idea and didn’t see it addressed in any of the threads before the forum closed. If one made an all ssd pool, would a log/cache drive just slow you

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Neil Perrin
On 10/28/11 00:54, Neil Perrin wrote: On 10/28/11 00:04, Mark Wolek wrote: Still kicking around this idea and didnt see it addressed in any of the threads before the forum closed. If one made an all ssd pool, would a log/cache drive just slow you

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Mark Wolek
Having the log disk slowed it down a lot in your tests (when it wasn't a SSD), 30MB/s vs 7. Is this is also a 100% write / 100% sequential workload? Forcing sync? It's gotten to the point where I can buy a 120G SSD for less or the same price as a 146G SAS disk...Sure the MLC drives have

Re: [zfs-discuss] Log disk with all ssd pool?

2011-10-28 Thread Neil Perrin
On 10/28/11 11:21, Mark Wolek wrote: Having the log disk slowed it down a lot in your tests (when it wasnt a SSD), 30MB/s vs 7. Is this is also a 100% write / 100% sequential workload? Forcing sync? 100% synchronous write. Writes are random but ZFS will write them