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тАО07-12-2002 02:51 PM
тАО07-12-2002 02:51 PM
5/14 thread: full fsck req'd after BC split
I use only EMC equipment, and based on experience there, I would have said he might need to "sync;sync" (or sync;sync;sync if you're really old) before splitting. With EMC, there is no need to unmount the original filesystems before initiating the split; I only stop the relevant apps that are writing.
I'm only assuming that the reference to "BC" means HP's XP. I'm trying to learn more about HP storage so I can evaluate HP vs EMC.
Can someone from an HP storage world address my question/point out my mis-assumptions? TIA.
--M????a
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тАО07-22-2002 05:31 PM
тАО07-22-2002 05:31 PM
Re: 5/14 thread: full fsck req'd after BC split
And most file writes do not stop when the app stops...there's all that data in the buffer cache that must be flushed out.
That's why umount takes a while before completing on a busy filesystem. So, no matter how many syncs are done, the filesystem was never un-mounted when it is split and there is no way for the opsystem to know if the entries are still valid without checking every entry. The simple concept of writing to a disk went away about a decade or two ago.
Bill Hassell, sysadmin
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тАО07-23-2002 08:45 AM
тАО07-23-2002 08:45 AM
Re: 5/14 thread: full fsck req'd after BC split
I do what I described in my previous post -- stop apps, sync, split -- and I never have to do a full fsck. I wanted to know if it were a requirement of XP or simply a result of the way this individual handled the systems. It sounds like the latter.
I do want to figure out whether XP storage will do what I need, and then, whether it's worthwhile to replace EMC with it.
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тАО07-24-2002 12:57 AM
тАО07-24-2002 12:57 AM
Re: 5/14 thread: full fsck req'd after BC split
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тАО07-24-2002 09:13 AM
тАО07-24-2002 09:13 AM
Re: 5/14 thread: full fsck req'd after BC split
My issue is why is a FULL fsck required. In my four years of experience with EMC hardware, using the procedure outlined above, I have never had to do a FULL one. fsck, yes, of course, but not FULL. Not -o full. And I certainly don't need to unmount things.
--Misa
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тАО08-01-2002 09:14 AM
тАО08-01-2002 09:14 AM
Re: 5/14 thread: full fsck req'd after BC split
A full fsck validates the integrety of your data. Something you really want to do prior to backing it up. You are betting your business on the ability to successfully recover your data in the event of a disaster.
Not doing a umount before the split is an unnecessary risk.
IMHO
Marty
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тАО08-02-2002 03:08 PM
тАО08-02-2002 03:08 PM
Re: 5/14 thread: full fsck req'd after BC split
I am legitimately trying to understand the reason everyone is saying this because it flies in the face of all my experience. I'm currently investigating the topic with some HP experts and if I can come up with a detailed technical basis for supporting either position, I'll try to post it.
--Misa
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тАО08-08-2002 08:42 AM
тАО08-08-2002 08:42 AM
Re: 5/14 thread: full fsck req'd after BC split
Marty