Date: Mon, 14 Mar 2005 10:38:02 +0100 (CET) From: Ludo Koren <lk@tempest.sk> To: freebsd-questions@freebsd.org Subject: Backup on DDS-4 tapes Message-ID: <200503140938.j2E9c2EM024428@lk.tempest.sk>
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Hi, I am using 5.2.1-RELEASE-p3 for backup on DDS-4 tapes 40GB in size. # df -k Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/vinum/root 1016162 157405 777465 17% / devfs 1 1 0 100% /dev /dev/vinum/usr 84746248 54467390 23499160 70% /usr procfs 4 4 0 100% /proc # camcontrol devlist -v scbus0 on ahd0 bus 0: <IBM IC35L018UWD210-0 S5BS> at scbus0 target 3 lun 0 (pass0,da0) <IBM IC35L073UWDY10-0 S25F> at scbus0 target 9 lun 0 (pass1,da1) <HP C5683A C005> at scbus0 target 10 lun 0 (sa0,pass2) < > at scbus0 target -1 lun -1 () scbus1 on ahd1 bus 0: <IBM IC35L018UWD210-0 S5BS> at scbus1 target 1 lun 0 (pass3,da2) <IBM IC35L073UWDY10-0 S23C> at scbus1 target 8 lun 0 (pass4,da3) < > at scbus1 target -1 lun -1 () scbus-1 on xpt0 bus 0: < > at scbus-1 target -1 lun -1 (xpt0) # /sbin/dump -SLu0 -B 41943040 -C 32 -f /dev/sa0 /usr DUMP: Date of this level 0 dump: Mon Mar 14 10:29:51 2005 DUMP: Date of last level 0 dump: the epoch DUMP: Dumping snapshot of /dev/vinum/usr (/usr) to /dev/sa0 DUMP: mapping (Pass I) [regular files] DUMP: Cache 32 MB, blocksize = 65536 DUMP: mapping (Pass II) [directories] DUMP: estimated 54189311 tape blocks on 1.29 tape(s). # # mt -f /dev/sa0 status Mode Density Blocksize bpi Compression Current: 0x26:DDS-4 variable 97000 DCLZ ---------available modes--------- 0: 0x26:DDS-4 variable 97000 DCLZ 1: 0x26:DDS-4 variable 97000 DCLZ 2: 0x26:DDS-4 variable 97000 DCLZ 3: 0x26:DDS-4 variable 97000 DCLZ --------------------------------- Current Driver State: at rest. --------------------------------- File Number: 0 Record Number: 0 Residual Count 0 I am using the following command: # /sbin/dump -Lu0 -B 41943040 -C 32 -f /dev/sa0 /usr or # /sbin/dump -aLu0 -C 32 -f /dev/sa0 /usr Why I cannot dump the filesystem on 2 tapes (it takes 3, it seems it works without compression) no matter if I use dump or cpio? What I am doing wrong? Any hints appreciated. Thank you very much in advance. Regards, lk
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