Raid-1 SCSI drive speed issue

Tuesday, 4 May 2004

I recently had a hard-drive get marked as faulty by the software raid
(after about 6 Months of running.) I have since replaced the drive and
re-added it as per HOT SWAP in the howto
http://www.tldp.org/HOWTO/Software-RAID-HOWTO-4.html#ss4.2

My problem is this, the current speed on the second drive is really
slow, I'm not sure if this is just function of the limit it has during
the rebuild or if when the original failure occurred the SCSI bus marked
this target as "slow" and it is stuck at this speed.

Anyone have any insights into this?

SETUP:

Linux franklin 2.4.22-1.2174.nptlsmp #1 SMP

Adaptec AIC79xx driver version: 1.3.10
Adaptec AIC7902 Ultra320 SCSI adapter
aic7902: Ultra320 Wide Channel A, SCSI Id=7, PCI-X 67-100Mhz, 512 SCBs
Allocated SCBs: 5, SG List Length: 102

Problem:

Target 0 Negotiation Settings
        User: 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
        Goal: 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
        Curr: 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
        Transmission Errors 0
        Channel A Target 0 Lun 0 Settings
                Commands Queued 134776253
                Commands Active 2
                Command Openings 30
                Max Tagged Openings 32
                Device Queue Frozen Count 0
Target 1 Negotiation Settings
        User: 320.000MB/s transfers (160.000MHz DT|IU|QAS, 16bit)
        Goal: 10.869MB/s transfers (10.869MHz)
        Curr: 10.869MB/s transfers (10.869MHz)
        Transmission Errors 235
        Channel A Target 1 Lun 0 Settings
                Commands Queued 129918824
                Commands Active 1
                Command Openings 31
                Max Tagged Openings 32
                Device Queue Frozen Count 0

-- 
Mike Tremaine