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
-----Original Message-----
From: Alvin Oga [mailto:[EMAIL PROTECTED]]
Sent: April 16, 2001 8:34 PM
To: Jason A. Lixfeld
Cc: [EMAIL PROTECTED]
Subject: Re: Looking for the best solution
hi ya jason...
i just added a drive into my (sw) raid5 array w/o any problems
on a raid patched system ( 2.2.18-chds )
raidhotadd /dev/md0 /dev/sdxx1
- i dont know what happens if the primary goes down and
you start running on the mirror'd disk -- replace the
failed primary and than try to resync...
thanx
alvin
http://www.Linux-1U.net ... 1U Raid5 -- 500Gb NAS ...
On Mon, 16 Apr 2001, Jason A. Lixfeld wrote:
> List,
>
> Currently I have 3 x Maxtor 81GB 5400RPM ATA100 drives and 3 x Maxtor
60GB
> 5400RPM ATA100 drives running off of two Promise PDC20267 cards. The
disks
> are all in one LV using LVM with ReiserFS. We're having this unique
problem
> where now if data is written to the LV, the cpu shoots up to 100% so we're
> thinking there is a bad drive somewhere although all diagnostic
information
> is clean making the search extreamly difficult. Anyway, we're looking for
a
> RAID solution that will allow us to add disks on the fly without
recreating
> the entire raid. To my knowledge Linux RAID0 can't do it because of the
> striping and Linux RAID5 still can't do it, but my information may be
> incorrect. Can anyone lay down the facts for me?
>
> If infact Linux RAID0 || 5 can't have drives added on the fly, I'm looking
> at hardware RAID, possibly by using 3Ware cards. One of my questions
about
> 3Ware cards is if it's possible to have 2+ cards full of devices and have
> them all in one single RAID as opposed to having multiple raids. If 3Ware
> can't do it, can promise do it with 2+ of their RAID controllers? How is
> the support for both with linux?
>
> Any help is appreciated.
>
> TiA
>
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