This One Time, at Band Camp, Florian Philipp <[EMAIL PROTECTED]> said, On Sat, Feb 16, 2008 at 01:50:04AM +0100:
> On Sat, 2008-02-16 at 00:32 +0100, Wael Nasreddine wrote: > > > To your filesystem scheme: Why do you use xfs for usr? AFAIK XFS is good > > > at write speed but not worth the trouble when reading data and data in > > > usr is usually written once, updated every few months and read many > > > times a week (on rebooting Desktop PCs maybe once a day). I'd use > > > reiserfs3.6, maybe even without notail to make it more space efficient. > > I don't use XFS, curently I only have / and /home and I want to split > > it to more smaller partitions, I'm on LVM so it's easy, anyway I'm > > going with ReiserFS for /usr /var, would you please suggest > > mkfs.reiserfs options as I have nerver used ReiserFS-3 before (yep 5 > > years using linux and I've always used ext3...) also You didn't mention > > /var, would you say ReiserFS-3 is a good choice as well? > I don't think there's alot to do when creating a reiserfs. You could > change the number of blocks for the journal. A bigger journal allows > larger transactions which speed up write actions but might waste space. > If you've got a second hard drive you could use an external journal but > I've never done any benchmarking on that issue although I use it on my > personal wannabe server (a raid1 and a single disk for the journal and > unimportant data). > I didn't comment on /var because I don't know how you use it. I suspect > it to hold alot of temporal data like lock files, spools and so on. So > there's a lot of creating and removing files going on, possibly in > parallel. XFS is good in parallel and in creating files but terrible in > removing files. Reiserfs with notail seems a good choice if you ask me > (what you did ;) ) > > > I'd also use ext2 on /usr/portage. These data don't need journaling. > > > Everything's got an MD5-sum to make sure it's unchanged after a crash > > > and you can easily resync. I found ext2 with 2k blocks to be faster than > > > reiserfs3.6, even on read-performance. > > I've already made the partition as suggested in [1] I used this > > command: > > $ mke2fs -b 1024 -N 200000 -m 0 -O dir_index > > I guess 1K block size would be faster?? > I'm not sure. 2K blocks might reduce fragmentation. > If you look at the output of > find /usr/portage/ -type f | xargs du -h --apparent-size > you'll see that there are quiet a few files larger than 1K but most are > smaller and might stay that small. So yes, I think 1K is a good choice > but you won't loose much with 2K, maybe you even gain some speed. > > > If I were you, I'd also use separate volumes for /tmp and /var/tmp > > > (without ccache) with xfs. > > What did you mean by 'without ccache'? I have ccache and I use it... > I meant that you should keep ccache on a separate partition. I just > think: Less stuff in the FS, less work on allocation and lookup, more > speed. And there's a lot of stuff in 2GB ccache. > By the way: I don't think /var/tmp is a good place for ccache (not > technically, just for the sake of layout). I've moved it to /var/db > since it's not really a bunch of temporary data but more like a changing > database. > > > /home could use data=journal. Those data are precious and if I remember > > > correctly, this setting even brings an obscure (i.e. undocumented) speed > > > improvement with many parallel disk accesses, for example in a > > > multi-user environment. > > it's done, thanks, BTW what's your home partition FS? your choice is > > ext3 or reiserFS?? > I use reiserfs3.6 without notail but that doesn't mean that it would be > a good choice for you. I'm on laptop and disk space efficiency is a big > topic for me so I use tail-packing wherever suitable. And yes, I am a > fan of ReiserFS-3.6. I think it's the best multipurpose FS. You can > easily adapt it for high performance or high disk space efficiency. If > its journaling would be as good as Ext3's data=journal I'd use it > everywhere except for small partitions (ext2) and big files (ext3 and > xfs). > > One last thing, since I'm on LVM resizing the partition is a must > > feature, in ext3 I use resize2fs which works quite nicely, is > > resize_reiserfs as reliable as resize2fs is?? > Yes, it's just as good and the sky's the limit for resizing :) > Oh, by the way: If you choose to use XFS somewhere, keep in mind that > you can't shrink and XFS-FS. Neither online nor offline. > One last thing: It's a bit old but I think it's still interesting, > especially for XFS-users: > http://everything2.com/index.pl?node_id=1479435 Thank you for your detailed answer it helped a lot, I just finished resizing/migrating all partitions, Though I still have the Storage partition, which is for my Mp3z and is almost 70Gb, with ext3, I'll see later if I do migrate to ReiserFS or not but the rest is done, please take a look at the file attached... and if you have any more suggestions please do tell me. Thanks a lot guys.... -- Wael Nasreddine http://wael.nasreddine.com PGP: 1024D/C8DD18A2 06F6 1622 4BC8 4CEB D724 DE12 5565 3945 C8DD 18A2 .: An infinite number of monkeys typing into GNU emacs, would never make a good program. (L. Torvalds 1995) :.
# Fstab
/dev/system/gentoo-root / ext3 defaults
0 1
/dev/whd120.1 /common-boot ext2 defaults
0 0
/dev/system/home /home reiserfs
defaults,user_xattr 0 0
/dev/system/gentoo-overlays /home/overlays ext2 defaults
0 0
/dev/system/gentoo-usr /usr reiserfs defaults
0 0
/dev/system/gentoo-var /var reiserfs defaults,notail
0 0
/dev/system/tmp /tmp xfs defaults
0 0
/dev/system/var-tmp /var/tmp xfs defaults
0 0
/dev/system/storage /mnt/storage ext3
defaults,user_xattr 0 0
/dev/system/swap none swap sw
0 0
/dev/cdrom /mnt/cdrom iso9660 noauto,ro,user
0 0
proc /proc proc defaults
0 0
shm /dev/shm tmpfs
nodev,nosuid,noexec 0 0
# Sizes: (120Gb Hdd)
/dev/system/gentoo-root 1G
/dev/system/gentoo-overlays 1G
/dev/system/gentoo-usr 4G
/dev/system/gentoo-var 500M
/dev/system/tmp 500M
/dev/system/var-tmp 100M
I use gentoo/paludis building on another partition... the gentoo-overlays
partition is
the one for /usr/portage but actually I use paludis and so I have all overlays
(gentoo and
whatever layman gets) in /home/overlays...
pgp81P3d8Uskj.pgp
Description: PGP signature
