Date: Thu, 29 Mar 2007 19:48:34 -0400 From: Nicolas Blais <nb_root@videotron.ca> To: freebsd-fs@freebsd.org Subject: gjournal questions Message-ID: <200703291948.40100.nb_root@videotron.ca>
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[-- Attachment #1 --] Hi, I've posted this here since this is probably the place to get an answer :) I've been experimenting with gjournal with the hopes of using it in my new multi-TB server (SuperMicro 5015M-NTB) . I have several questions, hopefully someone can help me out (long read though!). 1. I simulated a crash (hard power-off while transfering files). When I rebooted, I got the following on my console: ad0: 78167MB <Maxtor 6Y080L0 YAR41BW0> at ata0-master UDMA133 acd0: DVDR <HL-DT-ST DVDRAM GSA-4163B/A105> at ata1-master UDMA33 ad4: 76319MB <Seagate ST3808110AS 3.AAE> at ata2-master SATA150 ad6: 76319MB <Seagate ST3808110AS 3.AAE> at ata3-master SATA150 ad10: 76319MB <Seagate ST380817AS 3.42> at ata5-master SATA150 GEOM_JOURNAL: Journal 2822006383: ad10s1 contains data. GEOM_JOURNAL: Journal 2822006383: ad10s1 contains journal. GEOM_JOURNAL: Journal ad10s1 clean. acd0: FAILURE - INQUIRY ILLEGAL REQUEST asc=0x24 ascq=0x00 sks=0x40 0x00 0x01 ar0: 76293MB <Promise Fasttrak RAID1> status: READY ar0: disk0 READY (master) using ad4 at ata2-master ar0: disk1 READY (mirror) using ad6 at ata3-master <snip> WARNING: /usr was not properly dismounted WARNING: /var was not properly dismounted WARNING: R/W mount of /mnt/journaled denied. Filesystem is not clean - run fsck Only /mnt/journaled (ad10s1.journal) is gjournaled. Why doesn't fsck, which is running in background mode by now, check my /mnt/journaled and tag it clean? I have to manually fsck /dev/ad10s1.journal and manually remount it. This is a no-go because I want my system to be able to run without the helps of us, bipeds even in the event of a crash :). /usr and /var where fsck'ed in background as expected. Therefore, is it possible to make a crash recovery with gjournal without the need of humains? Can I boot from a crash, with background_fsck="NO" and still mount the journaled FS? 2. Since my new server will require a fresh installation, can I set up my gjournal slices from within sysinstall by choosing "Custom NewFS" and putting the -J option in there? Will that load the gjournal module? What is the correct way to implement gjournal (and if possible with gmirror) from a fresh start? 3. From gjournal(8) man page: "It is not recommended to use gjournal for small file systems (e.g.: only few gigabytes big)." How much is a "few"? Is it < 10gb? <50gb? I intend to use gjournal on /var (10gb), /usr (100gb), /home (1tb) and some misc mounts. (~25-100gb). 4. I'm thinking of using gmirror instead of my MB's onboard raid. I found from previous posts that I can mount async, disable soft-updates and that for simplicity it would be better to mirror the whole drive instead of slices (which is what I'm intending to do). Anything else I could use/know about using gmirror and gjournal? Thank you VERY MUCH for your help. Nicolas. -- FreeBSD 7.0-CURRENT #18: Sun Mar 25 16:03:50 EDT 2007 nicblais@clk01a:/usr/obj/usr/src/sys/CLK01A PGP? : http://plaintext.clkroot.net/security/nb_root.asc [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQBGDFBS4wTBlvcsbJURAlyRAJ9LGemZXaE1TVVUbt5ubDX5RnVOlQCggOiD LpDSTu3/CCy5v7NZH3VRBUU= =In9E -----END PGP SIGNATURE-----help
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