Installation of bcache
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Hi,
I have now a new questions. I had compiled kernel from your git (it doesnt have functional btrfs driver probably, because of kernel panic when mounting btrfs partition from fstab at startup). I am running it right now. I see sysfs interface to bcache. I had compiled make-bcache tool. Here I get stucked. According to http://bcache.evilpiepirate.org/GettingStarted and also according to documentation in Documentation/bcache.txt I should run something like this:
make-bcache -b128k /dev/sde
When I run this command (with 512k param), it will give me this error:
blacktroja bcache-tools # ./make-bcache -b512k /dev/sda1 Must specify one of -C or -B
blacktroja bcache-tools #
I have had a look at make-bcache implementation and <delete>as Iam sw engineer I dont like it (I dont like also many of my own codes).</delete> I get lost in it. It seems that I should give it one of parameter B or C. If I give it C, it will affect bucket size. If Ill give it B, it will affect bucket size and some version field in some structure. I think that it will create writethrough or writeback cache from device. Is this right?
Questions:
1. What parameter should I use, if I want cache (write-back) my root filesystem located on top of raid (/dev/md2)?
2. Is it possible to cache root file system in write-back style? (yes, I found an answer on bcache web. I hope, initramfs wont kill me till new year...)
3. What to do in shutdown script to be all right? (all dirti blocks from writeback device copied to main device. So I can on next boot omit using cache -> if any problems setting up cache in initramfs)
4. Can I register 3 partitons of single ssd disk as three cache devices and associate them with concrete filesystems? (so for example /home partition will be cached on 5G cache partition and / partition will be cached on 10G cache partition) (I think this is not possible right now)
PS: I want to set up cache and try to make chart/graph for booting times of my desktop. I hope, it will be lovering after some reboots. If anybody want to catch any other parameter than booting time, let me know.
Have a nice feriae days,
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LuVar
Quoted 30 lines · ----- [email protected] wrote:
Hi,
Quoted 4 lines · ----- "Kent Overstreet
Quoted 3 lines · LuVar
Hi,
I have started an installation process of bcache. Till now I was
(as
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an beginner foo in this type of tasks) able only to checkout (clone) an git repositories. Second one has tools. I had compiled them
without
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problem.
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Iam having some troubles with second one repository. I had
downloaded it (~317MB) and it appears to be an linux kernel. Iam running 2.6.34-gentoo-r12 kernel now and I want to keep this kernel and apply to its sources just patch, witch will add bcache functionality. Is it possible?
Just do a git diff v2.6.35...HEAD to get a patch. If that applies cleanly against your gentoo kernel you should be good to go.
Sorry, Iam too lame in this area. Would you mind to send me exact commands which to run? ("git diff v2.6.35...HEAD" complained something about unknown version). I have now 2.6.36 kernel (which have some cache capability mentioned in
Documentation/filesystems/caching/cachefiles.txt) in/usr/src/linuxdirectory (symlinked). Your git repository I have cloned in my home dir.
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PS: In few minutes Iam going to try your "TRIM whole ssd disk" script after running first iozone test on my new disk.
Have a nice Christmas time to all. (especially to them, who had bought a new ssd disk to himself :)
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