RAID Config question

Brian Gibson bgibson at wheatonma.edu
Thu Aug 29 07:39:00 CDT 2002


I am sorry I do not have an answer for you but..... you had mentioned a 
book in your email message. Is this a book on RAID config or is it just 
a Dell manual that came with the card? I would be interested in a good 
book on RAID if anyone knew of one. I pretty much have a handle on the 
basics but would like to know more about the penalties and benefits of 
each type of RAID.

Thanks,
bgibson

JP Vossen wrote:

>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..."
>
>_______________________________________________
>Linux-PowerEdge mailing list
>Linux-PowerEdge at dell.com
>http://lists.us.dell.com/mailman/listinfo/linux-poweredge
>Please read the FAQ at http://lists.us.dell.com/faq or search the list archives at http://lists.us.dell.com/htdig/
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.us.dell.com/pipermail/linux-poweredge/attachments/20020829/9d37ecf6/attachment.htm


More information about the Linux-PowerEdge mailing list