HP Ultrium 460 com Adaptec AIC7902, Baixa performace
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
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