When pulling a disk from a full (ie data and metadata) RAID 1 array, I see fsync(2) failing with EIO [1]. Reproduced easily [2]. Lastly, RAID 1 in BTRFS gives two copies of data regardless of number of drives, right? Daniel --- [1] $ fio workload.fio f1: (g=0): rw=write, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 ... f1: (g=0): rw=write, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 f2: (g=1): rw=randwrite, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 ... f2: (g=1): rw=randwrite, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 f3: (g=2): rw=read, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 ... f3: (g=2): rw=read, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 f4: (g=3): rw=randread, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 ... f4: (g=3): rw=randread, bs=4K-128K/4K-128K, ioengine=sync, iodepth=1 fio 1.50.2 Starting 16 processes f1: Laying out IO file(s) (1 file(s) / 1024MB) f1: Laying out IO file(s) (1 file(s) / 1024MB) f1: Laying out IO file(s) (1 file(s) / 1024MB) f1: Laying out IO file(s) (1 file(s) / 1024MB) f2: Laying out IO file(s) (1 file(s) / 1024MB) f2: Laying out IO file(s) (1 file(s) / 1024MB) f2: Laying out IO file(s) (1 file(s) / 1024MB) f2: Laying out IO file(s) (1 file(s) / 1024MB) f3: Laying out IO file(s) (1 file(s) / 1024MB) fio: pid=0, err=5/file:filesetup.c:136, func=fsync, error=Input/output error f3: Laying out IO file(s) (1 file(s) / 1024MB) fio: pid=0, err=5/file:filesetup.c:136, func=fsync, error=Input/output error f3: Laying out IO file(s) (1 file(s) / 1024MB) fio: pid=0, err=5/file:filesetup.c:136, func=fsync, error=Input/output error f3: Laying out IO file(s) (1 file(s) / 1024MB) fio: pid=0, err=5/file:filesetup.c:136, func=fsync, error=Input/output error f4: Laying out IO file(s) (1 file(s) / 1024MB) --- [2] cat - <<EOF >workload.fio [global] direct=0 directory=/mnt size=1024m bsrange=4k-128k timeout=60 numjobs=4 [f1] rw=write [f2] stonewall rw=randwrite [f3] stonewall rw=read [f4] stonewall rw=randread EOF mkfs.btrfs -m raid1 -d raid1 /dev/sdb /dev/sdc mount /dev/sdb /mnt fio workload.fio ... <pull sdb> -- Daniel J Blueman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
