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тАО04-22-2009 01:42 AM
тАО04-22-2009 01:42 AM
RedHat Linux boot from SAN - separate boot/root devices?
Looking at some boot from SAN documentation, such as the one below, it suggests: -
"It is recommend to have separate devices for the /boot and root (/) partitions."
Why is that? Does anyone actually do that? It seems silly to me to publish a separate device for /boot, especially on EVA where the minimum LUN size is 1Gb!
Is this just an old hangup from the days of pre-LBA and 1024 cylinders?
http://www.google.co.uk/url?sa=t&source=web&ct=res&cd=6&url=http%3A%2F%2Fbizsupport2.austin.hp.com%2Fbc%2Fdocs%2Fsupport%2FSupportManual%2Fc01513866%2Fc01513866.pdf&ei=t-LuSfHjHOXPjAeSmbEO&usg=AFQjCNGbn2H5cWEpygjE0z9Ix5acbLYCoQ&sig2=Sv7lRZV9an9JjDvevsJ4ZQ
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тАО04-22-2009 05:59 AM
тАО04-22-2009 05:59 AM
Re: RedHat Linux boot from SAN - separate boot/root devices?
For flexibility I recommend that most of the RHEL boot be LVM. RHEL can not boot from an LVM partition.
You should partition and present two LUNS to each system. First LUN should be the boot LUN.
I've never been a fan of SAN boot, due to the lack of diagnostics when there is a SAN problem.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО04-22-2009 06:53 AM
тАО04-22-2009 06:53 AM
Re: RedHat Linux boot from SAN - separate boot/root devices?
I'm struggling to understand a real reason to publish an additional 1Gb LUN (the smallest available on an EVA8100) only to waste 900Mb of it, when having a 100Mb partition on a sole 50Gb LUN works fine.
We have to boot from SAN as we are moving them to a BladeSystem and Virtual Connect.
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тАО04-23-2009 08:44 AM
тАО04-23-2009 08:44 AM
Re: RedHat Linux boot from SAN - separate boot/root devices?
# fdisk -l /dev/sda
Disk /dev/sda: 36.2 GB, 36203397120 bytes
255 heads, 63 sectors/track, 4401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 128 147 160650 83 Linux
/dev/sda2 148 2497 18876375 8e Linux LVM
/dev/sda3 2498 3541 8385930 82 Linux swap / Solaris
Then we use LVM ontop of the mulitpath or powerpath devices. We do not put swap under LVM control.
This works great for us.
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тАО04-23-2009 09:20 AM
тАО04-23-2009 09:20 AM
Re: RedHat Linux boot from SAN - separate boot/root devices?
Make /boot 1 GB. You can use the 900 MB of space for other files.
Or drop LVM and go with a 50 GB system that can not easily be re-sized.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com