Hello. wblock@ has suggest ask here ( https://forums.freebsd.org/viewtopic.php?f=48&t=46673&p=260858#p260870) . I am trying to build a bootable ZFS mirror on two USB-sticks. The sticks are nothing special: May 31 07:47:28 vmstor kernel: da0 at umass-sim0 bus 0 scbus3 target 0 lun 0 May 31 07:47:28 vmstor kernel: da0: < UFD 3.0 Silicon-Power16G PMAP> Removable Direct Access SCSI-6 device May 31 07:47:28 vmstor kernel: da0: Serial Number P1312160070B3C53D05D7171 May 31 07:47:28 vmstor kernel: da0: 40.000MB/s transfers May 31 07:47:28 vmstor kernel: da0: 15120MB (30965760 512 byte sectors: 255H 63S/T 1927C) May 31 07:47:28 vmstor kernel: da0: quirks=0x2<NO_6_BYTE>
Scrub single stick is fine: scan: scrub in progress since Sat May 31 08:36:45 2014 461M scanned out of 2,87G at 25,6M/s, 0h1m to go 0 repaired, 15,71% done But I got the drama, when I attach second stick: scan: resilver in progress since Sat May 31 07:49:55 2014 242M scanned out of 2,87G at 122K/s, 6h17m to go 242M resilvered, 8,25% done Both sticks are new. I tested it both with dd: single speed is about 33 Mbytes/s read and 25 Mbytes/s write. Simultaneously to both sticks read/write, read/read, write/write by dd is lower, but still acceptable: about 17-20 Mbytes/s. My system is FreeBSD 10.0-STABLE #0 r266463: Tue May 20 18:24:03 UTC 2014. Kernel configuration is pretty simple: include GENERIC ident vmstor nooptions INET6 nooptions AHC_REG_PRETTY_PRINT nooptions AHD_REG_PRETTY_PRINT options CONSPEED=19200 options IPFIREWALL options IPFIREWALL_VERBOSE options IPFIREWALL_VERBOSE_LIMIT=512 options IPFIREWALL_DEFAULT_TO_ACCEPT options IPDIVERT options DUMMYNET options SHMMAXPGS=65536 options SEMMNI=128 options SEMMNS=32000 options SEMUME=40 options SEMMNU=120 options SEMOPM=250 options SEMMSL=250 options SHMMNI=4096 options SHMSEG=4096 options MAXDSIZ="(1024*1027*1024)" options MAXSSIZ="(1024*1024*1024)" options DFLDSIZ="(1024*1024*1024)" options SHMMAX=2147483647 options SHMALL=2097152 Physcal hardware is desktop mainboards with Intel 82801G (ICH7) USB controller on first, and Intel PCH USB 2.0 controller on second computer. Also I bought VIA VT6202 USB 2.0 PCI controller to split sticks to different controllers on mainboard, but results are the same. I also tried gmirror with these sticks. It's rebuilding with high speed like 20-30 Mbytes/s, but dump/restore speed of my root filesystem to mirror of sticks (sure, after rebuild is finished) is same 100-200 KBytes per second. Is task to mirror data on USB sticks with FreeBSD possible? What did I do wrong? _______________________________________________ freebsd-usb@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"