Date: Wed, 28 Mar 2007 14:25:23 +0200 From: =?UTF-8?B?U3phYsOzIFDDqXRlcg==?= <matyee@mail.alba.hu> To: <freebsd-geom@freebsd.org> Subject: Re: raid3 is slow Message-ID: <005c01c77134$28e0fce0$6502a8c0@peteruj> References: <003401c7712a$f71ebb60$6502a8c0@peteruj> <eudlg8$pm4$1@sea.gmane.org>
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Yes, consumers are the disks.
# graid3 list
Geom name: nmivol
State: DEGRADED
Components: 5
Flags: NONE
GenID: 0
SyncID: 73
ID: 2396346217
Zone64kFailed: 0
Zone64kRequested: 13987
Zone16kFailed: 11189
Zone16kRequested: 28827400
Zone4kFailed: 71105
Zone4kRequested: 29207293
Providers:
1. Name: raid3/nmivol
Mediasize: 638906845184 (595G)
Sectorsize: 2048
Mode: r3w3e4
Consumers:
1. Name: label/nmivol2
Mediasize: 159726711808 (149G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Flags: HARDCODED
GenID: 0
SyncID: 73
Number: 1
Type: DATA
2. Name: label/nmivol1
Mediasize: 159726711808 (149G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Flags: HARDCODED
GenID: 0
SyncID: 73
Number: 0
Type: DATA
3. Name: label/nmivol3
Mediasize: 159726711808 (149G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Flags: HARDCODED
GenID: 0
SyncID: 73
Number: 2
Type: DATA
4. Name: label/nmivol4
Mediasize: 159726711808 (149G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Flags: HARDCODED
GenID: 0
SyncID: 73
Number: 3
Type: DATA
#systat -vmstat
4 users Load 1.62 1.75 1.82 Mar 28 14:24
Mem:KB REAL VIRTUAL VN PAGER SWAP PAGER
Tot Share Tot Share Free in out in out
Act 66488 6968 150740 11396 31172 count
All 1017076 10160975701764 16256 pages
1 zfod Interrupts
Proc:r p d s w Csw Trp Sys Int Sof Flt cow 4066 total
1 60 9820 68312106 4237 752 1 195968 wire 1002 0: clk
79088 act 128 8: rtc
89.2%Sys 3.0%Intr 3.3%User 0.0%Nice 4.5%Idl 714076 inact 10 10:
fxp
| | | | | | | | | | 29068 cache 1780 11:
ata
=============================================+>> 2104 free 573 14:
ata
12 daefr 573 15:
ata
Namei Name-cache Dir-cache prcfr
Calls hits % hits % react
11 10 91 1 pdwake
4045 pdpgs
Disks ad0 ad1 ad2 ad3 ad6 intrn
KB/t 8.42 8.42 8.42 8.42 5.67 113904 buf
tps 287 287 287 287 1780 133 dirtybuf
MB/s 2.36 2.36 2.36 2.36 9.85 69984 desiredvnodes
% busy 25 26 24 26 99 21586 numvnodes
17495 freevnodes
I use mc to copy.
Matyee
>Szabó Péter wrote:
>
>> I have a raid3 setup with 5 consumers. it seems everything is all right,
>> but riad is very slow imho, but i don't have any >reference.
>
>You need to give more accurate information. What are the "consumers" you
>mention? Maybe you mean the disks/components of the RAID?
>
>> Now i copy from raid3 to a single hdd 75GB data. Nothing else run, except
>> ssh, and ftp. Before the copy my load is >0.1, after i star the copy the
>> load is 2.92 or higher, and the machine is very slow. I think this is not
>> normal, or is it?
>
>>Copy how? By "cp" from shell?
>
>> My config is:
>> AMD Barton 2500+ with 1GB memory.
>>
>> I stop the copy, load is 0.05, and start again, after a few seconds load
>> is 2.02.
>Due to the way raid3 works, it's by definition more CPU-intensive than
>most other RAID levels, but it shouldn't be even remotely slow as that.
>Also, since your load is > 2, what are the other CPU intensive tasks?
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