LVM and DRDB
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.
Wichert.
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Quoted 5 lines · Wichert Akkerman
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.
just curious, what is DRDB?
besides which kind of connection do you have beetween the two sites are you planning on doing syncronous updates (i suspect such, since you are planning to put lvm over it)
L.
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Luca Berra -- [email protected] Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \
Quoted 1 line · Previously Luca Berra
just curious, what is DRDB?
See linux-ha.org. DRDB is basically a RAID1 blockdevice via the network.
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besides which kind of connection do you have beetween the two sites are you planning on doing syncronous updates (i suspect such, since you are planning to put lvm over it)
Connection can be as fast as it takes, I suspect in this case it will be a ATM link used just for this.
Wichert.
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Quoted 4 lines · Wichert Akkerman
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.
Should work, at least LVM does proper stacking in 2.4.4-pre kernels and I gope DRDB does too.
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Jens Axboe
Quoted 2 lines · Previously Jens Axboe
Should work, at least LVM does proper stacking in 2.4.4-pre kernels and I gope DRDB does too.
Is there any hope for 2.2 kernels?
Wichert.
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Quoted 5 lines · On Friday, April 20, 2001 12:32:53 PM +0200 Wichert Akkerman…
Quoted 2 lines · Previously Jens Axboe
Should work, at least LVM does proper stacking in 2.4.4-pre kernels and I gope DRDB does too.
Is there any hope for 2.2 kernels?
Andrea's 2.2 kernels have a stacking patch, you want his 95_GFS-09_generic_map.patch. It makes it possible to stack raid and lvm, and is obvious enough that drdb shouldn't be hard to add.
-chris
Quoted 3 lines · Wichert
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.
Probably not out of the box. You will need to add the DRDB major number to the list of devices that LVM will check for PVs/VGs. Other than that (and the fact that the Linux kernel doesn't support block devices > 2TB) you should be fine. Hopefully you have some sort of journaled filesystem for this?
Cheers, Andreas
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Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
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Hopefully you have some sort of journaled filesystem for this?
Either ext3 or reiserfs, depending on the kernel we use. Doing a fsck on 5TB of data is not something I would enjoy doing :)
Wichert.
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"Wichert" == Wichert Akkerman <[email protected]> writes:
Quoted 1 line · Wichert> Previously Andreas Dilger wrote:
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Hopefully you have some sort of journaled filesystem for this?
Wichert> Either ext3 or reiserfs, depending on the kernel we Wichert> use. Doing a fsck on 5TB of data is not something I would Wichert> enjoy doing :)
For a file system that size you might want to look at XFS instead.
Jes
Quoted 1 line · Previously Jes Sorensen
For a file system that size you might want to look at XFS instead.
How stable is XFS compared to ext3 and reiserfs? For this system minimum downtime is very important..
Guess I'll have to add XFS to the things-to-test-soon list.
Wichert.
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Quoted 7 lines · Wichert Akkerman
Quoted 1 line · Previously Jes Sorensen
For a file system that size you might want to look at XFS instead.
How stable is XFS compared to ext3 and reiserfs? For this system minimum downtime is very important..
Guess I'll have to add XFS to the things-to-test-soon list.
Might as well add GFS while you're at it. :)
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Quoted 1 line · Previously AJ Lewis
Might as well add GFS while you're at it. :)
That was already on there. I might need to move my change earth rotation to create 34 hour days' plan to the top though so I can get around to the rest. I bet that would be easier then the build time machine' approach.
Wichert.
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Quoted 7 lines · Wichert Akkerman
Quoted 1 line · Previously AJ Lewis
Might as well add GFS while you're at it. :)
That was already on there. I might need to move my
change earth rotation to create 34 hour days' plan to the top though so I can get around to the rest. I bet that would be easier then thebuild time machine' approach.
I dunno. Time machines are that hard to build...and they mess the rest of us up less than a 34 hour day would. ;)
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AJ Lewis Sistina Software Inc. Voice: 612-379-3951 1313 5th St SE, Suite 111 Fax: 612-379-3952 Minneapolis, MN 55414 E-Mail: [email protected] http://www.sistina.com Current GPG fingerprint = 3B5F 6011 5216 76A5 2F6B 52A0 941E 1261 0029 2648 Get my key at: http://www.sistina.com/~lewis/gpgkey (Unfortunately, the PKS-type keyservers do not work with multiple sub-keys) -----Begin Obligatory Humorous Quote---------------------------------------- Employment tip #127: Never take a beer to a job interview. -----End Obligatory Humorous Quote------------------------------------------
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"Wichert" == Wichert Akkerman <[email protected]> writes:
Quoted 1 line · Wichert> Previously Jes Sorensen wrote:
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For a file system that size you might want to look at XFS instead.
Wichert> How stable is XFS compared to ext3 and reiserfs? For this Wichert> system minimum downtime is very important..
I mkfs.xfs'ed the / and /home filesystems on my primary workstation on September 7th last year.
'nuff said... :)
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Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc. [email protected], http://www.linuxcare.com/ SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
Quoted 10 lines · Martin K. Petersen
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"Wichert" == Wichert Akkerman <[email protected]> writes:
Quoted 1 line · Wichert> Previously Jes Sorensen wrote:
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For a file system that size you might want to look at XFS instead.
Wichert> How stable is XFS compared to ext3 and reiserfs? For this Wichert> system minimum downtime is very important..
I mkfs.xfs'ed the / and /home filesystems on my primary workstation on September 7th last year.
What happens with I/O loads? (I've heard that XFS dies a nasty death - but that was early this year).
Thanks,
Jeff Layton
Quoted 12 lines
'nuff said... :)
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SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
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"Jeffrey" == Jeffrey B Layton <[email protected]> writes:
Wichert> How stable is XFS compared to ext3 and reiserfs? For this Wichert> system minimum downtime is very important..
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I mkfs.xfs'ed the / and /home filesystems on my primary workstation on September 7th last year.
Jeffrey> What happens with I/O loads? (I've heard that XFS dies a Jeffrey> nasty death - but that was early this year).
We're fine to the extent that 2.4 is fine. The latter has had a few rough edges but is getting better.
FWIW, at lot of people are using XFS in production now. So do check it out:
http://oss.sgi.com/projects/xfs/
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Martin K. Petersen, Principal Linux Consultant, Linuxcare, Inc. [email protected], http://www.linuxcare.com/ SGI XFS for Linux Developer, http://oss.sgi.com/projects/xfs/
Quoted 5 lines · Wichert Akkerman
Quoted 1 line · Previously Jes Sorensen
For a file system that size you might want to look at XFS instead.
How stable is XFS compared to ext3 and reiserfs? For this system minimum downtime is very important..
Well, it is SGI/IRIX technology so it should be hugely scalable and stable itself. It is a bit new on the Linux port, though (like IBM JFS) but a lot of people seem to be trusting it already.
I personally don't think Reiser/ext3 have a significant headstart yet. Reiser does have the odd B(*? +?)-tree magic technology inside =) they so lobby.
I remember seeing a feature comparsion somewhere. LJ perhaps?
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What will you be using as a filesystem for your 5TB server. EXT2 isn't much fun on our 1TB server ;-)
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jeffrey hundstad
Quoted 15 lines · Wichert Akkerman
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.
Wichert.
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sorry... i guess this has been covered....
Quoted 11 lines · Jeffrey Hundstad
What will you be using as a filesystem for your 5TB server. EXT2 isn't much fun on our 1TB server ;-)
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jeffrey hundstadQuoted 3 lines · Wichert Akkerman
Does anyone know if LVM will work correctly on top of DRDB? I need to keep an off-site copy of a 5TB fileserver synchronized and that might be an usefull approach.