Filesystems in 7.0 & reliability
freebsd at meijome.net
Wed Nov 7 06:19:52 PST 2007
I've been using 7 for a couple of weeks now on my work laptop (kickstarted by cooling issues while in 6.2, which seem to have largely gone in 7).
I have a 100GB SATA drive in a Thinkpad Z60m with
CPU: Intel(R) Pentium(R) M processor 2.00GHz (1995.02-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x6d8 Stepping = 8
real memory = 1609433088 (1534 MB)
avail memory = 1567780864 (1495 MB)
I installed 7 on a normal UFS disk, but then migrated to having /usr in a UFS journaled partition , with a 1.5 GB journal on ad0s1h . I didn't have any issue that I could directly relate to it. I had more hangs than now (i reverted back to plain UFS due to too many lock ups). The lock ups didnt leave any message or error anywhere - it seemed as if the disk subsystem stopped accepting commands (or was waiting on something ...) - anything in memory would work just fine, but as soon as disk access was needed, it 'd stall.
Something else i also noticed is that, after every crash, I couldn't just reboot and use my computer just fine, as I would have expected - maybe I'm wrong here.
I had to go into single user mode, and run a fsck /dev/ad0s1f.journal . this takes about 4 minutes. Hardly any errors were ever found (as opposed to my non-journal partitions, which had files de-referenced ,etc.) So I suppose, in that regards, gjournal worked great.... but is the fsck needed??
I am also very interested in what zfs has to offer. How reliable is it? I am looking into using it both on my laptop, and as a filesystem for some large storage , possibly.
thanks for any ideas, comments, pointers :)
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