Pessoal, tenho um servidor com uma unidade de fita para backup que está
apresentando baixa velocidade ao gravar. Preciso da ajuda de vocês para
aumentar a velocidade.
A fita deveria chegar a uns 30MB/s, mas consegui apenas 2,5MB/s.
Estou usando Debian Etch. A unidade de fita é uma HP Ultrium 460, e está
ligada a uma Adaptec AIC7902. Tenho dois HDs em RAID-1 por software,
ligados em outra Adaptec AIC7902.
Testei a gravação na fita com:
$ tar cf /dev/st0 --totals /home
E tenho este resultado:
Total bytes written: 6089707520 (5,7GiB, 2,5MiB/s)
Abaixo seguem mais informações.
Muito obrigado pela atenção.
Favor responder com cópia para mim.
==========
$ lsscsi
==========
[0:0:0:0] disk MAXTOR ATLAS10K5_147SCA JNZH /dev/sda
[0:0:1:0] disk MAXTOR ATLAS10K5_147SCA JNZH /dev/sdb
[1:0:6:0] tape HP Ultrium 2-SCSI F63D /dev/st0
==========
$ lspci -nn
==========
04:02.0 SCSI storage controller [0100]: Adaptec AIC-7902B U320
[9005:801d] (rev 10)
04:02.1 SCSI storage controller [0100]: Adaptec AIC-7902B U320
[9005:801d] (rev 10)
==========
$ dmesg
==========
scsi0 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 3.0
<Adaptec AIC7902 Ultra320 SCSI adapter>
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz,
512 SCBs
Vendor: MAXTOR Model: ATLAS10K5_147SCA Rev: JNZH
Type: Direct-Access ANSI SCSI revision: 03
target0:0:0: asynchronous
scsi0:A:0:0: Tagged Queuing enabled. Depth 32
target0:0:0: Beginning Domain Validation
target0:0:0: wide asynchronous
target0:0:0: FAST-160 WIDE SCSI 320.0 MB/s DT IU QAS RTI (6.25 ns,
offset 127)
target0:0:0: Ending Domain Validation
Vendor: MAXTOR Model: ATLAS10K5_147SCA Rev: JNZH
Type: Direct-Access ANSI SCSI revision: 03
target0:0:1: asynchronous
scsi0:A:1:0: Tagged Queuing enabled. Depth 32
target0:0:1: Beginning Domain Validation
target0:0:1: wide asynchronous
target0:0:1: FAST-160 WIDE SCSI 320.0 MB/s DT IU QAS RTI (6.25 ns,
offset 127)
target0:0:1: Ending Domain Validation
ACPI: PCI Interrupt 0000:04:02.1[B] -> GSI 17 (level, low) -> IRQ 185
scsi1 : Adaptec AIC79XX PCI-X SCSI HBA DRIVER, Rev 3.0
<Adaptec AIC7902 Ultra320 SCSI adapter>
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 67-100Mhz,
512 SCBs
Vendor: HP Model: Ultrium 2-SCSI Rev: F63D
Type: Sequential-Access ANSI SCSI revision: 03
target1:0:6: asynchronous
target1:0:6: Beginning Domain Validation
target1:0:6: wide asynchronous
target1:0:6: Domain Validation skipping write tests
target1:0:6: Ending Domain Validation
[...]
st: Version 20050830, fixed bufsize 32768, s/g segs 256
st 1:0:6:0: Attached scsi tape st0
st0: try direct i/o: yes (alignment 512 B)
==========
$ less /proc/scsi/aic79xx/1
==========
Adaptec AIC79xx driver version: 3.0
Adaptec AIC7902 Ultra320 SCSI adapter
aic7902: Ultra320 Wide Channel B, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
Allocated SCBs: 4, SG List Length: 128
[...]
Target 6 Negotiation Settings
User: 320.000MB/s transfers (160.000MHz RDSTRM|DT|IU|RTI|QAS,
16bit)
Goal: 3.300MB/s transfers
Curr: 3.300MB/s transfers
Channel A Target 6 Lun 0 Settings
Commands Queued 5439
Commands Active 0
Command Openings 1
Max Tagged Openings 0
Device Queue Frozen Count 0
