LaFountain [EMAIL PROTECTED]
To: Mike Black [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Sent: Thursday, July 05, 2001 8:05 AM
Subject: Re: raid1 doesn't boot in degraded mode
Try un-installing lilo and re-installing it.
lilo -U
I think I may have run into a similar problem writing to only one disk.
Also
I'm testing 2-4-6-pre6 vs 2.4.5
I see a boost in performance for raid5 (up to 14%) and raid1
md0 is dual IDE drivers
md3 is a 3x36G SCSI
md4 is a 7x36G Fibre Channel
hdparm test -- note that individual disk speeds did not change between
kernel versions
Linux 2.4.5 ext2
dev/md0:
Timing buffered
Looks like all these patches are in 2.4.6-pre5 -- so I did a benchmark on my
RAID1 -- Dual IDE.
Note that I upgraded the machine from a single PIII/550 to a Dual PIII/600
(same motherboard) between these benchmarks.
However there are still some interesting differences.
Looks like threaded read
Thankyou for all the suggestions for names for mdctl.
We have
raidctl raidctrl
swraidctl
mdtools mdutils
mdmanage mdmgr mdmd:-) mdcfg mdconfig mdadmin
Mike Black suggested that it is valuable for tools that are related to
start with a common prefix so that command completion can be used
OK...I'll stick my (worthless) opinion in here.
I personally like root-based packages...so all I have to do is type
raidtab to see all my raid commands:
Already OK:
raidstart
raidstop
raidhotadd
raidhotremove
raidsetfaulty
raid0run
Need:
raidmk (instead of mkraid)
raidmdctl
raidmkpv (instead
Ohhh...does this mean I can move ALL of my disks and still start the
array? I've had a couple times now when I removed one disk and ALL the
others bumped down a notch so raid wouldn't autostart. It would find the
first disk but the others would all be out-of-place.
Alsocan mdctl be
I just combined two machines into one:
Machine#1
/dev/md4 - sda1,sdb1,sdc1,sdd1,sde1,sdf1,sdg1
Machine#2
/dev/md3 - sda1,sdb1,sdc1
I moved the disks from Mach#2 to Mach#1 and was unable to start /dev/md4
(md3 worked just fine)
The disks for md4 had moved to sdd1,sde1,sdf1,sdg1,sdh1,sdj1,sdi1
I'll post the same thing to this list that I sent to the original poster --
seems many people aren't aware of the limitation
on how many devices you can put on an ultra-wide and the impact on max cable
length:
From http://www.ramelectronics.net/html/scsi_help.html
If five devices are used (four
