root@pangaea:~# dd if=/dev/zero of=/dev/null bs=1M count=32000 33554432000 bytes (34 GB, 31 GiB) copied, 1.89847 s, 17.7 GB/s
root@pangaea:~# dd if=/dev/zero of=test.zero bs=1M count=32000 conv=fsync
33554432000 bytes (34 GB, 31 GiB) copied, 29.3056 s, 1.1 GB/s
root@pangaea:~# dd if=test.zero of=/dev/null bs=1M
33554432000 bytes (34 GB, 31 GiB) copied, 27.9066 s, 1.2 GB/s
root@pangaea:~# tapeinfo -f /dev/nst0
Product Type: Tape Drive
Vendor ID: 'IBM '
Product ID: 'ULTRIUM-HH7 '
Revision: 'K4K1'
Attached Changer API: No
SerialNumber: '10WT141102'
MinBlock: 1
MaxBlock: 8388608
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: 0x78
Density Code: 0x5c
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0xff
DeCompType: 0xff
Block Position: 5264131
Partition 0 Remaining Kbytes: -1
Partition 0 Size in Kbytes: -1
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 3
Device {
Name = IBM-LTO7
Media Type = LTO
Archive Device = /dev/nst0
Automatic Mount = yes
Always Open = yes
Removable Media = yes
Random Access = no
Maximum Spool Size = 256GB
Spool Directory = /home/bacula/spool
Maximum File Size = 32GB
# Maximum Block Size = 524288
Maximum Block Size = 1048576
Backward Space File = yes
Fast Forward Space File = yes
}
19-Apr 16:46 pangaea-dir JobId 1466: Start Backup JobId 1466,
Job=srv.2021-04-19_16.00.00_05
19-Apr 16:46 pangaea-dir JobId 1466: Using Device "IBM-LTO7" to write. 19-Apr 16:46 pangaea-sd JobId 1466: Spooling data ...19-Apr 17:10 pangaea-sd JobId 1466: User specified Device spool size reached: DevSpoolSize=256,000,176,844 MaxDevSpoolSize=256,000,000,000 19-Apr 17:10 pangaea-sd JobId 1466: Writing spooled data to Volume. Despooling 256,000,176,844 bytes ... 19-Apr 17:26 pangaea-sd JobId 1466: Despooling elapsed time = 00:15:54, Transfer rate = 268.3 M Bytes/second
19-Apr 17:26 pangaea-sd JobId 1466: Spooling data again ...19-Apr 17:52 pangaea-sd JobId 1466: User specified Device spool size reached: DevSpoolSize=256,000,176,881 MaxDevSpoolSize=256,000,000,000 19-Apr 17:52 pangaea-sd JobId 1466: Writing spooled data to Volume. Despooling 256,000,176,881 bytes ... 19-Apr 18:08 pangaea-sd JobId 1466: Despooling elapsed time = 00:16:13, Transfer rate = 263.1 M Bytes/second
19-Apr 18:08 pangaea-sd JobId 1466: Spooling data again ...19-Apr 18:16 pangaea-sd JobId 1466: Committing spooled data to Volume "G-0620-6". Despooling 56,071,784,596 bytes ... 19-Apr 18:19 pangaea-sd JobId 1466: Despooling elapsed time = 00:03:04, Transfer rate = 304.7 M Bytes/second 19-Apr 18:19 pangaea-sd JobId 1466: Elapsed time=01:32:46, Transfer rate=102.0 M Bytes/second 19-Apr 18:19 pangaea-sd JobId 1466: Sending spooled attrs to the Director. Despooling 6,326 bytes ...
19-Apr 18:19 pangaea-dir JobId 1466: Bacula pangaea-dir 9.6.7 (10Dec20): HTH, Udo Am 21.04.21 um 09:14 schrieb fk+bacula--- via Bacula-users:
Hello there, I'm using a Quantum LTO-7 HH drive with Ultrium LTO-7 tapes. The streamer is connected on a SAS HAB microsemi 1100-4i. I set the Maximum block size = 524288 and run: speed file_size=3 skip_raw with zero data and bacula block structure Total Write rate = *311.7 MB/s* with random data: Total Write rate = *94.74 MB/s*For backup I use the spooling function. Two SATA hdd's are build a RAID-0 (stripe) array.This array is used for holding the spooling data (spool directory) testing: **** write test ****dd if=/dev/zero of=/backup_spool/testfile bs=1M count=204800 conv=fdatasync,notrunc204800+0 Datensätze ein 204800+0 Datensätze aus 214748364800 bytes (215 GB, 200 GiB) copied, 596,839 s, *360 MB/s* **** read test **** dd if=/backup_spool/testfile of=/dev/null bs=1M count=204800 204800+0 Datensätze ein 204800+0 Datensätze aus 214748364800 bytes (215 GB, 200 GiB) copied, 625,029 s, *344 MB/s*Have made test backup (1,1 TByte) and have monitored a constant write rate of 200 MByte/s during despooling.Are the write values of the tape drive OK for a LTO-7 environment? Thanks for any hints, Frank
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