RAID Config question

JP Vossen vossenjp at netaxs.com
Wed Aug 28 19:08:00 CDT 2002


I am about to replace an old server with a new PE500SC /w IDE RAID 5 (CERC) &
RH 7.3 box that I mentioned in my other post (CERC RAID screwed up).  I've
gathered some stats about my existing files.

The existing server is a dual iP166MMX with a 40 Gig IDE drive.  The
environment is my house, so the 500SC is way overkill, but what the heck.  2
users is about the max it'll see... :-)  I'll have an extra 40 Gig IDE drive
for swap and /tmp, so I won't take the RAID write hit there.  (I was a little
worried about /tmp because I sometime need to sort files of hundreds of
thousands of line.)

Can anyone give me some recommendations for settings when I rebuild the RAID
volume?  I read the book, so I have a clue what each setting IS, but I'm not
sure what is BEST for me.  I'm wondering about the following.

Stripe size
Write policy
Read policy
Cache policy (this is very confusing in the book)


My existing file system as a whole looks like this:

Number of files:	136,562
Average size:		249,708
Total size:		34,100,581,409

File		Count	Total Size
< 8k		79,151	162,433,395
8 to 16k	11,995	142,866,609
16 to 32k	13,702	323,605,958
32 to 64k	12,539	580,088,542
64 to 128k	8,376	766,835,512
128 to 200k	3,237	531,248,098
200 to 300k	1,827	456,422,688
300 to 500k	1,740	691,218,515
500 to 750k	920	578,144,523
750 to 1000k	687	606,530,942
1 to 1.5m	849	1,074,565,043
1.5 to 2m	338	592,708,539
2 to 3m		340	861,391,789
3 to 4m		297	1,024,534,854
4 to 5m		118	548,451,680
5 to 10m	244	1,838,820,789
10 to 20m	97	1,317,543,432
20 to 50m	45	1,486,771,810
50 to 100m	29	2,296,012,348
> 100m		31	18,220,386,343



Just /home looks like this:

Number of files:	59,601
Average size:		536,641
Total size:		31,984,316,020

File		Count	Total Size
< 8k		18,422	40,254,539
8 to 16k	5,340	65,159,224
16 to 32k	9,401	225,164,402
32 to 64k	10,364	480,981,169
64 to 128k	6,894	625,045,061
128 to 200k	2,528	409,779,093
200 to 300k	1,520	380,435,649
300 to 500k	1,535	609,033,718
500 to 750k	808	508,525,894
750 to 1000k	552	487,920,717
1 to 1.5m	800	1,013,893,562
1.5 to 2m	304	533,944,287
2 to 3m		307	781,396,487
3 to 4m		285	981,618,671
4 to 5m		115	534,072,850
5 to 10m	233	1,765,832,998
10 to 20m	92	1,254,360,739
20 to 50m	43	1,425,881,300
50 to 100m	29	2,296,012,348
> 100m		29	17,565,003,312


TIA,
JP
------------------------------|:::======|--------------------------------
JP Vossen, CISSP              |:::======|                jp at jpsdomain.org
My Account, My Opinions       |=========|       http://www.jpsdomain.org/
------------------------------|=========|--------------------------------
"The software said it requires Windows 98 or better, so I installed
Linux..."




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