Re: Reading takes 100% precedence over writes for mdadm+raid5?

2007-12-05 Thread Jon Nelson
I saw something really similar while moving some very large (300MB to 4GB) files. I was really surprised to see actual disk I/O (as measured by dstat) be really horrible. -- Jon - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to [EMAIL PROTECTED] M

Re: raid6 check/repair

2007-12-05 Thread Bill Davidsen
Peter Grandi wrote: [ ... on RAID1, ... RAID6 error recovery ... ] tn> The use case for the proposed 'repair' would be occasional, tn> low-frequency corruption, for which many sources can be tn> imagined: tn> Any piece of hardware has a certain failure rate, which may tn> depend on things like

Re: Kernel 2.6.23.9 + mdadm 2.6.2-2 + Auto rebuild RAID1?

2007-12-05 Thread Nix
On 1 Dec 2007, Jan Engelhardt uttered the following: > > On Dec 1 2007 06:19, Justin Piszcz wrote: > >> RAID1, 0.90.03 superblocks (in order to be compatible with LILO, if >> you use 1.x superblocks with LILO you can't boot) > > Says who? (Don't use LILO ;-) Well, your kernels must be on a 0.90-s

Re: async_tx: get best channel

2007-12-05 Thread Yuri Tikhonov
Hello, On Tuesday 23 October 2007 22:16, Dan Williams wrote: > The problem with moving this test to async_tx_find_channel() is that it > imposes extra overhead in the fast path. It would be best if we could > keep all these decisions in the slow path, or at least hide it from > architectures th

Re: assemble vs create an array.......

2007-12-05 Thread David Greaves
Dragos wrote: > Thank you for your very fast answers. > > First I tried 'fsck -n' on the existing array. The answer was that If I > wanted to check a XFS partition I should use 'xfs_check'. That seems to > say that my array was partitioned with xfs, not reiserfs. Am I correct? > > Then I tried th

Re: raid6 check/repair

2007-12-05 Thread Leif Nixon
[EMAIL PROTECTED] (Peter Grandi) writes: > ms> I just want to give another suggestion. It may or may not be > ms> possible to repair inconsistent arrays but in either way some > ms> code there MUST at least warn the administrator that > ms> something (may) went wrong. > > tn> Agreed. > > That soun