[mythtv-users] OT: Filesystems for recordings

[Mark Paulus]

Brad DerManouelian wrote:
> On Nov 28, 2006, at 8:51 AM, Jay R. Ashworth wrote:
> 
>> On Tue, Nov 28, 2006 at 10:50:38AM -0600, Allan Wilson wrote:
>>>    I am planning on rebuilding my mythbackend since I got in some  
>>> new hardware
>>>    and I am planning on using LVM to span across a couple of  
>>> drives. I have 4
>>>    or 5 video sources through PVR cards and firewire. I will have  
>>> somewhere in
>>>    the neighborhood of 1 to 1.5 TB of storage. I was wondering  
>>> what everyone
>>>    would recommend for using as the filesystem type for the LVM  
>>> storage? Last
>>>    go around I was using XFS but I was wondering if there was  
>>> something better
>>>    to use because of all the read/writes and large filesystem  
>>> size. So what do
>>>    you think.
>> Check the archive; we did this last month.
>>
>> I use XFS (though not on the root partition), some people prefer, I
>> think, JFS.
> 
> I use JFS and am quite happy with the performance. My only issue is  
> if my box goes down unexpectedly (power out or something), it doesn't  
> always come back clean. I need to run fsck.jfs before I can mount  
> them again but I never have a problem after running it. I wish there  
> was better support for checking for these errors on boot and  
> automagically running fsck.jfs if needed.
There is a way.  Do a 'man fstab', and check out the info on the 6th 
field, <pass>.  If you set a value in there, it will run fsck for you at 
mount time. If the filesystem is clean, then the fsck is very fast:

Tue Nov 28 14:38:38 2006: Checking all file systems...
Tue Nov 28 14:38:38 2006: fsck 1.37 (21-Mar-2005)
Tue Nov 28 14:38:38 2006: fsck.jfs version 1.1.7, 22-Jul-2004
Tue Nov 28 14:38:38 2006: fsck.jfs version 1.1.7, 22-Jul-2004
Tue Nov 28 14:38:38 2006: processing started: 11/28/2006 14.38.38
Tue Nov 28 14:38:38 2006: The current device is:  /dev/hda5
Tue Nov 28 14:38:38 2006: /dev/hdc1: clean, 579088/5003712 files, 
6949206/1000440 blocks
Tue Nov 28 14:38:38 2006: processing started: 11/28/2006 14.38.38
Tue Nov 28 14:38:38 2006: The current device is:  /dev/hdb1
Tue Nov 28 14:38:38 2006: Block size in bytes:  4096
Tue Nov 28 14:38:38 2006: Filesystem size in blocks:  1054612
Tue Nov 28 14:38:38 2006: **Phase 0 - Replay Journal Log
Tue Nov 28 14:38:38 2006: Filesystem size in blocks:  2048752
Tue Nov 28 14:38:38 2006: **Phase 0 - Replay Journal Log
Tue Nov 28 14:38:38 2006: Filesystem is clean.
Tue Nov 28 14:38:38 2006: Filesystem is clean.
Tue Nov 28 14:38:38 2006: Setting kernel variables ...

These are sort of small filesystems, but I don't think that my 3 disk 
LVM volume with 600+GB is that much slower on it's fsck.



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-- 
Mark Paulus
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