Re: Temporary 'lock-up' under heavy write, MegaRAID RAID-5
From: Dave Ewart (davee_at_ceu.ox.ac.uk)
Date: 11/10/05
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- In reply to: Dave Ewart: "Temporary 'lock-up' under heavy write, MegaRAID RAID-5"
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Date: Thu, 10 Nov 2005 15:05:44 +0000 To: debian-amd64@lists.debian.org, debian-user@lists.debian.org
On Wednesday, 09.11.2005 at 10:46 +0000, Dave Ewart wrote:
> System: 4-way Opteron, generic Debian Sarge AMD64
> RAID controller: LSI Logic MegaRAID 320-1, 64MB cache
> RAID config: Three 146GB 15K SCSI/320 disks, RAID-5
> Kernel: 2.6.14 SMP, includes megaraid driver
>
> The above system is incredibly fast under almost all conditions, except
> when writing very large files (say, 100s of MB, or even GB). When
> writing such files, the system effectively locks-up for many seconds -
> typically, for as long as it takes to finish writing/flushing the file
> to disk. This lock-up affects all other processes: local text editor
> sessions, workstations with /home NFS-mounted, [...]
A partial solution to the lock-up for NFS-mounted /home workstations:
set the NFS mount option 'async', rather than let it assume the default
of 'sync' ... oops.
Dave.
-- Dave Ewart davee@ceu.ox.ac.uk Computing Manager, Cancer Epidemiology Unit Cancer Research UK / Oxford University PGP: CC70 1883 BD92 E665 B840 118B 6E94 2CFD 694D E370 Get key from http://www.ceu.ox.ac.uk/~davee/davee-ceu-ox-ac-uk.asc N 51.7518, W 1.2016
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- Previous message: Martijn Marsman: "Re: Installing VMware on Debian 3.1 kernel 2.6.14"
- In reply to: Dave Ewart: "Temporary 'lock-up' under heavy write, MegaRAID RAID-5"
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