Re: Need help recovering a raid5 array

2006-10-24 Thread David Greaves
[EMAIL PROTECTED] wrote: > Hello all, Hi First off, don't do anything else without reading up or talking on here :) The list archive has got a lot of good material - 'help' is usually a good search term!!! > > I had a disk fail in a raid 5 array (4 disk array, no spares), and am > having troub

Raid5 or 6 here... ?

2006-10-24 Thread Gordon Henderson
Heres an oddity - Just built a server with 15 external disks over 2 SAS channels and I've noticed that the kernel is saying it's RAID5 rather than RAID6 ... Hard to explain what I mean in words, but: bertha:~# cat /proc/mdstat Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] md9 : a

Re: resync starts over after each reboot (2.6.18.1)?

2006-10-24 Thread Dexter Filmore
Am Montag, 23. Oktober 2006 18:43 schrieben Sie: Sound familiar... two things: what exact LVM2 version are you using there? Could you try and shutdown the machine completely till power off and cold boot it a couple of times and see if the issue persists? Dex -- -BEGIN GEEK CODE BLOCK-

Re: resync starts over after each reboot (2.6.18.1)?

2006-10-24 Thread Tomasz Chmielewski
Dexter Filmore wrote: Am Montag, 23. Oktober 2006 18:43 schrieben Sie: Sound familiar... two things: what exact LVM2 version are you using there? Could you try and shutdown the machine completely till power off and cold boot it a couple of times and see if the issue persists? Yes, shutting do

Re: Raid5 or 6 here... ?

2006-10-24 Thread David Greaves
Gordon Henderson wrote: >1747 ?S< 724:25 [md9_raid5] > > It's kernel 2.6.18 and Wasn't the module merged to raid456 in 2.6.18? Are your mdx_raid6's earlier kernels. My raid 6 is on 2.7.17 and says _raid6 Could it be that the combined kernel thread is called mdX_raid5 David - To

Re: Raid5 or 6 here... ?

2006-10-24 Thread Gordon Henderson
On Tue, 24 Oct 2006, David Greaves wrote: > Gordon Henderson wrote: > >1747 ?S< 724:25 [md9_raid5] > > > > It's kernel 2.6.18 and > > Wasn't the module merged to raid456 in 2.6.18? Ah, was it? I might have missed that... > Are your mdx_raid6's earlier kernels. My raid 6 is on 2.7.1

Re: Raid5 or 6 here... ?

2006-10-24 Thread David Greaves
David Greaves wrote: > Gordon Henderson wrote: >>1747 ?S< 724:25 [md9_raid5] >> >> It's kernel 2.6.18 and > > Wasn't the module merged to raid456 in 2.6.18? > > Are your mdx_raid6's earlier kernels. My raid 6 is on 2.7.17 and says _raid6 > > Could it be that the combined kernel thr

RAID5/10 chunk size and ext2/3 stride parameter

2006-10-24 Thread martin f krafft
Hi, I cannot find authoritative information about the relation between the RAID chunk size and the correct stride parameter to use when creating an ext2/3 filesystem. My understanding is that (block * stride) == (chunk). So if I create a default RAID5/10 with 64k chunks, and create a filesystem w

Re: why partition arrays?

2006-10-24 Thread Bill Davidsen
Henrik Holst wrote: Bodo Thiesen wrote: Ken Walker <[EMAIL PROTECTED]> wrote: Is LVM stable, or can it cause more problems than separate raids on a array. [description of street smart raid setup] (The same function could probably be achieved with logical partitions and ordin

Re: why partition arrays?

2006-10-24 Thread dean gaudet
On Tue, 24 Oct 2006, Bill Davidsen wrote: > My read on LVM is that (a) it's one more thing for the admin to learn, (b) > because it's seldom used the admin will be working from documentation if it > has a problem, and (c) there is no bug-free software, therefore the use of LVM > on top of RAID wil

Re: Bug with RAID1 hot spares?

2006-10-24 Thread Bill Davidsen
Chase Venters wrote: Greetings, I was just testing a server I was about to send into production on kernel 2.6.18.1. The server has three SCSI disks with "md1" set to a RAID1 with 2 mirrors and 1 spare. I have to ask, why? If the array is mostly written you might save a bit of bus time, but

Re: Bug with RAID1 hot spares?

2006-10-24 Thread Chase Venters
On Tuesday 24 October 2006 20:41, Bill Davidsen wrote: > Chase Venters wrote: > >Greetings, > > I was just testing a server I was about to send into production on > > kernel > >2.6.18.1. The server has three SCSI disks with "md1" set to a RAID1 with 2 > >mirrors and 1 spare. > > I have to ask,