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RE: raid drive reconstruction time
by Yarmas, Tom 01 Jun '04

01 Jun '04

This is a feature of ONTAP 6.5.1+ It is called Rapid RAID Recovery (aka - sick disk copy) Read the release notes on the NOW site. -tom -----Original Message----- From: Mark Simmons [mailto:mds@gbnet.net] Sent: Tuesday, June 01, 2004 10:06 AM To: Busick, Chris Cc: Chris Thompson; toasters(a)mathworks.com; jbrigman(a)nc.rr.com Subject: Re: raid drive reconstruction time Busick, Chris wrote: >Here is a whitepaper link on Diagonal Parity if you haven't already >found it. > >http://www.netapp.com/tech_library/3298.html > > > Ah, but <jedi> this is not the feature we're looking for </jedi> it's how DOT handles copying data off failing disks that's of interest today. The double parity stuff was done to death a few weeks back istr. >--Chris Busick > >-----Original Message----- >From: Chris Thompson [mailto:cet1@cus.cam.ac.uk] >Sent: Tuesday, June 01, 2004 6:52 AM >To: toasters(a)mathworks.com >Cc: mds(a)gbnet.net; jbrigman(a)nc.rr.com >Subject: Re: raid drive reconstruction time > > >Mark Simmons <mds(a)gbnet.net> writes; > > >>James Brigman wrote: >> >> >> >>>Steve; >>> >>>***************** >>>Netapp recently modified their disk reconstruct procedure to copy as >>>much valid data as possible from the failed disk and only reconstruct >>> >>> > > > >>>blocks that cannot be read. Often a disk does not completely fail, >>>so many blocks can be copied from it, which is much faster than >>>reconstructing. >>>***************** >>> >>>Can you please point us to a whitepaper on this? >>> >>> >[...] > > >>I have to say that, if a disk is known to be failing, I'm not sure I'd >>want to be trusting the data one would copy from it... >> >> > >Well, there is the "horizontal" data validation provided by the zone or >block checksums to deal with that. > > > >> Also, if it's >>failing in a way that makes it take a lot of time to serve a block of >>data, does DOT adjust its strategy accordingly and work out at some >>point that it should just started recreating the data from the other >> >> >disks? > >That seems like a good question, and I would echo James' request for a >whitepaper (or other form of technical detail). > >Is the same procedure used when a disk is failed by operator command as >well as when ONTAP decides to fail it on its own initiative? The case >of failing a disc because its reported error rate is too high for >comfort would seem to be one of the most likely scenarios when "many >blocks can be copied from it". > >Also, if ONTAP is rebooted during the reconstruction, is the >"half-failed" status of the disc preserved? > >Chris Thompson >Email: cet1(a)cam.ac.uk > >

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RE: raid drive reconstruction time
by Busick, Chris 01 Jun '04

01 Jun '04

Here is a whitepaper link on Diagonal Parity if you haven't already found it. http://www.netapp.com/tech_library/3298.html --Chris Busick -----Original Message----- From: Chris Thompson [mailto:cet1@cus.cam.ac.uk] Sent: Tuesday, June 01, 2004 6:52 AM To: toasters(a)mathworks.com Cc: mds(a)gbnet.net; jbrigman(a)nc.rr.com Subject: Re: raid drive reconstruction time Mark Simmons <mds(a)gbnet.net> writes; > > James Brigman wrote: > > >Steve; > > > >***************** > >Netapp recently modified their disk reconstruct procedure to copy as > >much valid data as possible from the failed disk and only reconstruct > >blocks that cannot be read. Often a disk does not completely fail, > >so many blocks can be copied from it, which is much faster than > >reconstructing. > >***************** > > > >Can you please point us to a whitepaper on this? [...] > I have to say that, if a disk is known to be failing, I'm not sure I'd > want to be trusting the data one would copy from it... Well, there is the "horizontal" data validation provided by the zone or block checksums to deal with that. > Also, if it's > failing in a way that makes it take a lot of time to serve a block of > data, does DOT adjust its strategy accordingly and work out at some > point that it should just started recreating the data from the other disks? That seems like a good question, and I would echo James' request for a whitepaper (or other form of technical detail). Is the same procedure used when a disk is failed by operator command as well as when ONTAP decides to fail it on its own initiative? The case of failing a disc because its reported error rate is too high for comfort would seem to be one of the most likely scenarios when "many blocks can be copied from it". Also, if ONTAP is rebooted during the reconstruction, is the "half-failed" status of the disc preserved? Chris Thompson Email: cet1(a)cam.ac.uk

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raid drive reconstruction time
by Aditya 01 Jun '04

01 Jun '04

Does anyone have ballpark numbers (for any filer model) how long a drive would take to reconstruct on a filer on the default raid reconstruct_speed setting? ie. on an F85: options raid.reconstruct_speed 4 I'm trying a ballpark compare against a Sun 3310 array with 73Gig drives, where it took almost excatly 5 hours. I realize it depends on filer load, but if the speed is linear with load and drive size then it is easy to extrapolate. I couldn't find a table or any other sort of indication on NOW about this... Adi

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CONFIDENTIAL PROPOSAL
by tony adams 30 May '04

30 May '04

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None
by ouocrqc＠msn.com 30 May '04

30 May '04

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RE: Quota problems with qtree names containing ampersand
by Ehrhart, Rick 28 May '04

28 May '04

See burt 112344 for details. http://now.netapp.com/NOW/cgi-bin/bol?Type=Detail&Display=112344 - Rick - > -----Original Message----- > From: Nicholas Chuah [mailto:nicholas_chuah@yahoo.com] > Sent: Friday, May 28, 2004 4:23 AM > To: toasters(a)mathworks.com > Subject: Quota problems with qtree names containing ampersand > > > I have few windows qtree with ampersand naming like F&B, when > issuing quota > on, there is no error messages. When checking the quota via > the Filer View, > it seems to stop halfway exactly at the location where the qtree in > question is, the rest of the lines does not get processed. > > How do I fix this? > > Nic > > > > > __________________________________ > Do you Yahoo!? > Friends. Fun. Try the all-new Yahoo! Messenger. > http://messenger.yahoo.com/ >

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Quota problems with qtree names containing ampersand
by Nicholas Chuah 28 May '04

28 May '04

I have few windows qtree with ampersand naming like F&B, when issuing quota on, there is no error messages. When checking the quota via the Filer View, it seems to stop halfway exactly at the location where the qtree in question is, the rest of the lines does not get processed. How do I fix this? Nic __________________________________ Do you Yahoo!? Friends. Fun. Try the all-new Yahoo! Messenger. http://messenger.yahoo.com/

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None
by bob＠mathworks.com 27 May '04

27 May '04

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PLEASE I NEED YOUR HELP/ASSISTANCE PLEASE
by bareclay ben 27 May '04

27 May '04

ATTN:Sir/Madam I know you would be surprised to receive this mail, but I would start by introducing my self I am MR BARCLAY BEN. A member of Charles Taylor Government, the ousted president of Liberia, my purpose of writing you this mail is to seek your assistance in retrieving my funds which I lodge in the security company in my country Liberia before the war started the security company move every belongies in there position to there head office in Europe for safety because of the war. I managed to escape out of Liberia to African were I am now for asylum including my President and some others members of our Government and l cannot retrieve it myself because of my Status Right Now. Well I need your assistance to clear this funds, if you are willing to assist me kindly notify me via this email address and I Will instruct you on the procedure that will enable us retrieve the Funds and we will also discuss your benefit for your assistance my Friend know that this assistance did not have any risk involved I have every prove and every documentation that Back the funds up. Waiting to hear from you. Best Regards. MR BARCLAY BEN.

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Undeliverable mail: Re: Proof of concept
by MAILER-DAEMON＠fe1.bc.edu 26 May '04

26 May '04

Failed to deliver to '' Virus(es) found. 000004b9.EML is infected with W32/Netsky.p@MM Viruses: 1 Trojans: 0 Jokes: 0 Tests: 0

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