[OpenAFS] OpenAFS and XFS

[Derek Atkins]

<brettholcomb@charter.net> writes:

> Sorry, I'm using webmail today and didn't notice the list defaulted to replying to you.

It should be the default on ALL lists.  Lists that reply to the list
are Bad because it makes it hard for a user to actually respond privately
when a private response in warranted.

> At this time I don't have any partitions available and don't want to have to create them.  

RTFM.

> How big a hit does no cache give you?

You cannot run with "no cache".  You must run with _some_ cache, even if
it's a small memory cache.  It means you'll have to go off to the network
on every request that isn't in the cache, which means all reads will be
network-latent as opposed to local-disk-latent.  OTOH, it depends how much
cache thrashing you expect on your system.

-derek

>
>> 
>> From: Derek Atkins <warlord@MIT.EDU>
>> Date: 2004/01/02 Fri PM 12:29:43 EST
>> To: <brettholcomb@charter.net>
>> CC: openafs-info@openafs.org
>> Subject: Re: [OpenAFS] OpenAFS and XFS
>> 
>> Please CC openafs-info on all replies!
>> 
>> <brettholcomb@charter.net> writes:
>> 
>> > Okay, that lets OpenAFS out for me then.
>> 
>> I don't see what's so hard about creating an ext2/3 partition for your
>> afs cache.  You should have a dedicated cache partition anyways.
>> Worst case you could use the -memcache option to afsd and skip the
>> persistent disk cache.
>> 
>> > Why the requirement for ext2/3 for cache?  Why not use whatever file
>> > system is there?
>> 
>> Because it needs direct access to the inodes via iget(); this works
>> for ext2/3, it does not work for reiserfs (or xfs, I believe) because
>> they (well, reiser for sure) breaks the user-space inode abstraction.
>> 
>> > Thank you.
>> 
>> -derek
>> 
>> -- 
>>        Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
>>        Member, MIT Student Information Processing Board  (SIPB)
>>        URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
>>        warlord@MIT.EDU                        PGP key available
>> 
>
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available