Thanks for all your insightfull replys
Here's the state of my xfsprogs/TODO:
DONE - version 2 logs
DONE - attr2
BUG - lazy superblock counters
It looks like it's a fixed bug that should be commited soon:
>[itchy] dmesg -c
>[itchy] dd if=/dev/zero of=blah bs=1 seek=100G count=1
1+0 records in
1+0 records out
1 byte (1 B) copied, 0.00151443 s, 0.7 kB/s
# this is my patched mkfs
>[itchy] mkfs.xfs -f -l lazy-count=1 blah
meta-data=/home/xaiki/blah isize=256 agcount=8, agsize=3276800 blks
= sectsz=512 attr=2
data = bsize=4096 blocks=26214400, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096
log =internal log bsize=4096 blocks=12800, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
>[itchy] mount -o loop blah /mnt
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
>[itchy] dmesg -c
XFS: bad version
XFS: SB validate failed
DONE - version 2 inodes
DONE - dropping the ability to turn unwritten extents off completely
DONE/ASK - imaxpct default can be reduced
> Given that 25% on a 4GB filesystem will allow about 5million inodes,
> I think it's probably reasonable to bring it down to 5% by the time we
> pass 1TB and 1% by 50TB.....
I implemented this as a simple step function, do we need something smarter ?
ASK - larger log
> Another one for you - make the log larger. The kernel code supports
> a log of up to 2GB, so mkfs could making a larger log without
> requiring changes elsewhere.
dchiner told me that we have issues with big logs, anyway, how much shall
I increase the default ?
ASK - less allocation groups for single disk configs
Again, being quite new, I'd need magnitude orders of what's reasonable, I now
by 2 the AG size, witch gives me 2x less AGs.
Eric: mkfs.conf sounds like a great idea to me, but i don't think it should
be exclusive to XFS.
Please find attached the early patches, comments are welcome.
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