Messages in this thread | | | Date | Wed, 29 Sep 1999 17:23:10 +0200 (CEST) | From | Ronald Wahl <> | Subject | Re: high load on heavy disk i/o (fwd) |
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Maybe its not scsi related - so i repost this here...
---------- Forwarded message ---------- Date: Tue, 28 Sep 1999 03:47:45 +0200 (CEST) From: Ronald Wahl <rwahl@gmx.net> To: linux-scsi <linux-scsi@vger.rutgers.edu> Subject: Re: high load on heavy disk i/o
On Mon, 27 Sep 1999, Ronald Wahl wrote:
> Hi, > > after installing a new disk (IBM DNES-309170W U2W SE/LVD - was cheaper > than the UW model :-) on my SYMBIOS Controller (sym53c875 rev. 4). I > noticed that during heavy disk i/o (e.g. creating a cdrom image or doing > "cat /dev/zero > some_file") the load goes up to 3 or more and the system > becomes totally unusable. Mostly all programs called during this time > starting after the i/o load is gone. First I thought it was the cable > length since it was 2m in length and ultra scsi spec doesn't allow greater > than 1.5m in my case. Both ends are are terminated (active). I even had > some wrong data during transfer (but very seldom). So I shorted my narrow > cable to fit the spec. But at least the problem with the heavy load and > system unusability is still there. Without this new disk I had no such > problems. What's the problem here? > <...>
The following may be relevant: mke2fs created most of my partions with a blocksize of 4096 bytes (which seems to speed things greatly up!). Maybe the driver has a problem with this greater blocks. I have similar problems (high load, system unusable) with my MO drive which uses 2048 byte blocks (even under 2.0.36 this was a problem).
ron
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