hi ya jason
for my raid5 stuff...
- i've not had any "raid5" disk failures...
- simulated some failures ( pull the diskout )
and wound up rebuilding the array from backup
( faster/easier...guaranteed data integrety )
- resync failed for me a couple years ago....
never tried(had to try) resyncing since ...
- i always keep backups of raid5 disks
- faster to backup from backup systems
- usually 1hr to rebuild a clean "system disks"
- however long it takes to restore 10Gb or 500Gb of data
- done it a few times... 2x in 3 yr at different clients
( learned: keep root passwd away from people )
- if restore or resync time is an issue...
- build a separate mirror of the entrire 500Gb raid5
- have a few reiserFS raid5 out in the field...
- e2fsck is a pain to run even at 60Gb...
- running my small raid5 on celeron-500...
- uses mostly for backups so am not worried about performance
- if people have/want 500Gb raid5 system
( $1500 ide - 5x $300ea at 80Gb ea )
( $2500 scsi3 - 5x $400 at 36Gb ea )
....they should have the $$$ for a ( $500range) hardware
raid5 controller ... seems silly not to ???
have fun raiding...
alvin
http://www.Linux-1U.net .... 1U Raid5 ...
On Tue, 17 Apr 2001, Jason A. Lixfeld wrote:
> Hi Alvin,
>
> I'm using 2.4.2 Kernel so it should be fine, right?
>
> So lemme get this straight, I can raidhotadd a new drive, then I have to
> resize_[reiserfs][ext2] the raid, right?
>
> Should I stay away from ReiserFS if I'm going to go with Software RAID 5?
> The fact that the filesystem doesn't need to be fscked is amazing, but it's
> taking 3 days to resize_reiserfs -s -60G from an LV right now so I assume
> resizing a reiserfs'd raid 5 will be the same? Also, I saw a benchmark with
> the 2 3Ware cards illustrating that RAID 5 with ReiserFS performed EXTREAMLY
> poorly compared against an the same ext2 RAID 5 configuration. Can you
> confirm/deny this? I'm going to be using 3-4 Promise Ultra100 cards, not
> 3Ware, but I just want to know the benchmarks if anyone has any.
>
> Also, is it possible to mix two different size drives and use the full
> capacity of all drives in a RAID 5 (as long as the hot spare is at least the
> same size as the largest drive) or do all drives have to be the same size?
>
> In regards to your last comment:
>
> The root drive is a single IDE drive -- no raid, no nothing running plain
> old ext2. The RAID 5 is just holding the content. The root drive is easy
> to get back up. I'm not so worried about mirroring that as I am with the
> content.
>
> How long does it take to resynch or rebuild if you add a drive/have a
> failure and need to rebuild to the hot spare?
>
> FINALLY (promise) I hear there are certain rather hefty CPU/RAM requirments
> for Software RAID 5. How do you generally need for a 500+GB Software RAID
> 5?
>
> Thx again for any comments!!
>
> -JL
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