Re: Raid 5. Lost 2 drives.
jmm [m.allan noah] jmm The howto says try mkraid --force. With a 2 drive (2/4) will I lose jmm everything. jmm jmm why do you want to make a two drive raid5? that makes no sense. use raid1. jmm jmm If you *read* his message you'll notice that he has 4 drives in the jmm array and lost 2 of them (2 still active). :) jmm jmm yes- if there is data already on the drive, running mkraid is a pretty sure jmm way to destroy the filesystem, since part of the file system will be jmm overwritten. jmm jmm Incorrect. if it was a s/w raid device already, then nothing gets touched jmm except the raid super-block that was already there. Resync may occur, jmm but there are mkraid options to keep that from happening too. Something very similar happened to me and in the end I add to reconstruct 60.000 mail accounts with some thousands email messages lost... This probably nothing to do with Raid software but with the filesystem... Anyway, I gave up running Raid5 in this production server and I am now ruunig it in a 75Gig SCSI disc with reiserfs... There sure is a lack of documentation on what can be done in case of disk failure that would have helped a lot in my case and probably would have prevented this MAJOR loss of data... 8-(.. mcc
Journaling FS and RAID
I am about to implement a ~100 GB RAID-5 array using Linux software RAID-5 and I have two questions I was hoping I could find answers to here :) 1) Journaling Access speed is not terribly important in this instance but minimizing fsck time on reboot is somewhat important. It will be a mostly read-only environment but I'd like to not have to mount the volume as RO. Are any of the journaled file systems that are available for Linux compatible with the RAID system yet? (Or, perhaps more accuratly, is software raid compatible with journaling). Is anyone running journaling with software RAID? 2) Resizing RAID volumes I recall seeing once quite a while ago information regarding resizing of RAID volumes (as in, adding additional active drives) that stated RAID 0 resizing was functional, but not RAID-5. Does anyone know if any progress been made on this front or if anyone is working on it at all? I did some searching with google, but didn't find anything that really answered my question. Thanks. Sean
Re: Raid 5. Lost 2 drives.
Something very similar happened to me and in the end I add to reconstruct 60.000 mail accounts with some thousands email messages lost... You signed up 60,000 customers between your nightly backup and the failure point? I want to know where you advertise! Seriously, RAID is NOT the same as having good backups and vice versa. -HJC
Re: Journaling FS and RAID
On Mon, 26 Jun 2000, Sean Millichamp wrote: Are any of the journaled file systems that are available for Linux compatible with the RAID system yet? (Or, perhaps more accuratly, is software raid compatible with journaling). Is anyone running journaling with software RAID? IIRC, the ReiserFS is a journalling FS. I have been using the lastest version without problems until I tried to upgrade from 2.2.14 to 2.2.16... but I'm pretty sure my problem is more related to the software raid than the ReiserFS... my problem softraid array won't even format ext2-fs... I am using RAID0 with Reiser... there was a problem with using RAID5 on Reiser until recently... it's been fixed now. Steve Stephen Amadei Dandy.net CTO Atlantic City, NJ
Re: Journaling FS and RAID
On Mon, 26 Jun 2000, Sean Millichamp wrote:
I am about to implement a ~100 GB RAID-5 array using Linux software
RAID-5 and I have two questions I was hoping I could find answers to here
:)
...
2) Resizing RAID volumes
I recall seeing once quite a while ago information regarding resizing of
RAID volumes (as in, adding additional active drives) that stated RAID 0
resizing was functional, but not RAID-5. Does anyone know if any progress
been made on this front or if anyone is working on it at all? I did some
searching with google, but didn't find anything that really answered my
question.
There's been no progress here yet, but there will be in some time.
You can get the tool from http://ostenfeld.dtu.dk/~jakob/Software-RAID.HOWTO/
and it support RAID-0 resizing, but not yet RAID-5. Feel free to add
RAID-5 functionality yourself:)If noone else does, I'll do that
myself, but I can't make promises as to when that will happen. It could
be weeks or it could be months from now.
--
: [EMAIL PROTECTED] : And I see the elder races, :
:.: putrid forms of man:
: Jakob Østergaard : See him rise and claim the earth, :
:OZ9ABN : his downfall is at hand. :
:.:{Konkhra}...:
3 IDE controllers??
Hi.. does anyone know, if it is possible to run more than two ide controllers in one pc?? I testet my enviroment and got the result that a 2-disk (2 ide-controller) raid array is much faster than a 3 disk (2 controller) system.. and now i would like to upgrade with another controller.. if it is possible, which one runs best at lowest price? :-)) thanks.. c.u. ..patrick
Problem with raidhotremove
Anyone know why raidhotremove does not work? [root]# raidhotremove /dev/md0 /dev/sdb1 /dev/md0: can not hot-remove disk: disk busy! This is on a boiler-plate RH 6.2 system. I _think_ I could use the "failed-disk" feature and run mkraid --force, but I'm not sure, so I better don't...
