Re: we are finding that parity writes are half of all writes when writing 50mb files

We gave Neil Brown's patch a try, it is about three times faster than the stuff in the kernel. It avoids the unnecessary parity writes I first complained about when writing 50mb files, and we are going to document for reiserfs users that they should be using his patch. Hans - To unsubscribe

Re: we are finding that parity writes are half of all writes when writing 50mb files

Neil Brown wrote: On Monday November 27, [EMAIL PROTECTED] wrote: using reiserfs over raid5 with 5 disks. This is unnecessarily suboptimal, it should be that parity writes are 20% of the disk bandwidth. Comments? Is there a known reason why reiserfs over raid5 is way worse than

Re: we are finding that parity writes are half of all writes when writing 50mb files

On Tue, Nov 28, 2000 at 11:46:10AM -0700, Hans Reiser wrote: We need vm to push the FS which pushes raid, [..] This just happens. [..] and the FS needs to know about or even contain the stripe cache. That's not a blkdev layer issue but a FS-LVM/RAID issue. What's suboptimal at the moment

Re: we are finding that parity writes are half of all writes when writing 50mb files

On Tuesday November 28, [EMAIL PROTECTED] wrote: On Tue, Nov 28, 2000 at 10:50:06AM +1100, Neil Brown wrote: However, there is only one "unplug-all-devices"(*) call in the API that a reader or write can make. It is not possible to unplug a particular device, or better still, to

Re: we are finding that parity writes are half of all writes when writing 50mb files

On Mon, Nov 27, 2000 at 02:24:03PM -0700, Hans Reiser wrote: using reiserfs over raid5 with 5 disks. This is unnecessarily suboptimal, it should be that parity writes are 20% of the disk bandwidth. Comments? It would be great to have a number describing ``unnecessarily suboptimal'' more

Re: we are finding that parity writes are half of all writes when writing 50mb files

Jakob Østergaard ([EMAIL PROTECTED]) wrote on 27 November 2000 18:18: On Mon, Nov 27, 2000 at 02:24:03PM -0700, Hans Reiser wrote: using reiserfs over raid5 with 5 disks. This is unnecessarily suboptimal, it should be that parity writes are 20% of the disk bandwidth. Comments? It would

Re: we are finding that parity writes are half of all writes when writing 50mb files

On Mon, Nov 27, 2000 at 04:58:12PM -0200, Carlos Carvalho wrote: Jakob Østergaard ([EMAIL PROTECTED]) wrote on 27 November 2000 18:18: On Mon, Nov 27, 2000 at 02:24:03PM -0700, Hans Reiser wrote: using reiserfs over raid5 with 5 disks. This is unnecessarily suboptimal, it should be that

Re: we are finding that parity writes are half of all writes when writing 50mb files

Hans Reiser [EMAIL PROTECTED] writes: using reiserfs over raid5 with 5 disks. This is unnecessarily suboptimal, it should be that parity writes are 20% of the disk bandwidth. Comments? Is there a known reason why reiserfs over raid5 is way worse than ext2. Does ext2 optimize for