Re: [zfs-discuss] Re: Re: Heavy writes freezing system

2007-01-18 Thread Richard Elling
Rainer Heilke wrote: If you plan on RAC, then ASM makes good sense. It is unclear (to me anyway) if ASM over a zvol is better than ASM over a raw LUN. Hmm. I thought ASM was really the _only_ effective way to do RAC, but then, I'm not a DBA (and don't want to be ;-) We'll be just using raw

Re: [zfs-discuss] Re: Re: Heavy writes freezing system

2007-01-18 Thread Roch - PAE
If some aspect of the load is writing large amount of data into the pool (through the memory cache, as opposed to the zil) and that leads to a frozen system, I think that a possible contributor should be: |6429205||each zpool needs to monitor its throughput and throttle heavy wri

Re: [zfs-discuss] Re: Re: Heavy writes freezing system

2007-01-17 Thread Neil Perrin
Rainer Heilke wrote On 01/17/07 15:44,: It turns out we're probably going to go the UFS/ZFS route, with 4 filesystems (the DB files on > UFS with Directio). It seems that the pain of moving from a single-node ASM to a RAC'd ASM is great, and not worth it. > The DBA group decided doing the

Re: [zfs-discuss] Re: Re: Heavy writes freezing system

2007-01-17 Thread Casper . Dik
>We had a 2TB filesystem. No matter what options I set explicitly, the >UFS filesystem kept getting written with a 1 million file limit. >Believe me, I tried a lot of options, and they kept getting se t back >on me. The limit is documented as "1 million inodes per TB". So something must not have

Re: [zfs-discuss] Re: Re: Heavy writes freezing system

2007-01-17 Thread Neil Perrin
Anantha N. Srirama wrote On 01/17/07 08:32,: Bug 6413510 is the root cause. ZFS maestros please correct me if I'm quoting an incorrect bug. Yes, Anantha is correct that is the bug id, which could be responsible for more disk writes than expected. Let me try to explain that bug. The ZIL as d