[ubuntu-za] Slow boot hard drive issue [SOLVED]

Charl Wentzel charl.wentzel at vodamail.co.za
Fri Jan 20 22:20:44 UTC 2012

>  Oh yes,
> I'm also using LVM for my /home partition, but not for root.

Gotha!  After writing this I realised that this was the point at which
I starting having slow boot problems.  So some research here lead to a
bug with lvm during bootup... 


The fix was simple:  

Add --noudevsync parameter to the vgchange command in
/lib/udev/rules.d/85-lvm2.rules. Then regenerating the initramfs with
update-initramfs -u

Wow! Look at this difference:

[    1.784979] sd 2:0:0:0: Attached scsi generic sg1 type 0
[    1.785090] sd 2:0:0:0: [sda] 1465149168 512-byte logical blocks: (750 GB/698 GiB)
[    1.785095] sd 2:0:0:0: [sda] 4096-byte physical blocks
[    1.785210] sd 2:0:0:0: [sda] Write Protect is off
[    1.785215] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
[    1.785283] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
[    1.831553]  sda: sda1 sda2 sda3
[    1.832170] sd 2:0:0:0: [sda] Attached SCSI disk
[    2.088551] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)

--> 10 seconds!  I can live with that!

[   13.114360] udevd[314]: starting version 173
[   13.196201] lp: driver loaded but no devices found
[   13.221138] [Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
[   13.221244] [Firmware Bug]: _BCQ is used instead of _BQC

My laptop now boots in just over 30 seconds!  Very impressive for an
old paraffin model like mine. 

Thanks for the help guys!


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