Date: Wed, 12 May 1999 15:18:22 -0400 (EDT) From: "Mark J. Taylor" <mtaylor@cybernet.com> To: Matthew Jacob <mjacob@feral.com> Cc: freebsd-hackers@FreeBSD.ORG, Jim Carroll <jim@carroll.com> Subject: Re: fsck and large file system Message-ID: <XFMail.990512151822.mtaylor@cybernet.com> In-Reply-To: <Pine.LNX.4.04.9905121113090.22991-100000@feral.com>
next in thread | previous in thread | raw e-mail | index | archive | help
The problem that we ran into in a system with several 130 MB RAID5 arrays
is that the fsck was running out of RAM+swap. We had to add a vnode to swap
to before the fsck would complete (basically added more swap space).
We had to have over 100 MB swap space to fsck the 130 MB volume, and the
system has 64 MB RAM. This was is 2.2.8 (haven't upgraded it yet).
BTW: this system is getting VERY poor I/O performance, using the DPT SCSI RAID
controller and three arrays of four 49 GB Seagate drives. "iozone" reports
340,000 bytes/sec write and 9,800,000 bytes/sec read. This horrendous write rate
makes the system virtually unusable. Anyone have any ideas on improving the
performance? Would an upgrade from its 2.2.8 to 3.{1,2} help?
It is a Pentium 166. During the "iozone" test, there seems to be only a few
(less than 10) interrupts from the DPT card per second ("systat -vm 1").
Am I losing interrupts (it would seem so)... ?
-Mark Taylor
NetMAX Developer
mtaylor@cybernet.com
On 12-May-99 Matthew Jacob wrote:
>
>
>> > I was wondering if anyone has done any work on fsck and very large file
>> > systems. We have a system that has 126 GB RAID Array. As you can imagine,
>> > fsck chokes trying to alloc enough blocks to store it's internal data
>> > structures (128 MB RAM, 128 MB Swap)
>
> Huh- I remember fixing this for NetBSD. You have to do a setrlimit within
> fsck so it can malloc enough space and have enough swap to back that. We
> were fsck'ing 600GB+ filesystems.
>
>>
>> > We would like to treat this array as a single large disk, and was wondering
>> > if anyone else had run into this situation, and had a work around.
>>
>
> I've been doing 120GB+ filesystems for FreeBSD for quite some time. The
> real fun will be the 1TB filesystems.
>
>
>
>
>
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-hackers" in the body of the message
---
Mark J. Taylor Networking Research
Cybernet Systems mtaylor@cybernet.com
727 Airport Blvd. PHONE (734) 668-2567
Ann Arbor, MI 48108 FAX (734) 668-8780
http://www.cybernet.com/ http://www.netmax.com/
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?XFMail.990512151822.mtaylor>