Re: What are the disadvantages of soft updates?

On Mon, Apr 4, 2016 at 6:24 AM, Tinker wrote: ... > 1. Re EIO: I understand a disk write in softdep will compromise/crash the > filesystem. But the error reported below was that it crashes the *OS*. > > It seems to me that crashing the whole OS is a too harsh response to

Re: What are the disadvantages of soft updates?

Reading this "softdep" thread (that is https://marc.info/?l=openbsd-misc=142164001816142 ) was quite intriguing. Two followup questions: 1. Re EIO: I understand a disk write in softdep will compromise/crash the filesystem. But the error reported below was that it crashes the *OS*. It

Re: What are the disadvantages of soft updates?

Hello Given that one could change options for filesystem such as sync to async without remounting using mount -u -o options /what /where is this possible to disable softdep on the fly (without unmounting)? Second question: Does mounting fs with softdep *and* sync options is secure? For example

Re: What are the disadvantages of soft updates?

Alexandre Ratchov wrote, On 01/19/15 02:44: On Mon, Jan 19, 2015 at 03:59:34AM +, currellbe...@gmail.com wrote: Hello, The FAQ[1] states that soft updates result in a large performance increase in disk writing performance, and links to a resource[2] which claims that soft updates, in

Re: What are the disadvantages of soft updates?

Clint Pachl wrote: So softdep can definitely enhance performance. And according to Kirk McKusick, it also enhances FS consistency. So I think I'll be enabling softdep on my production servers. I'm sure all the bugs in that complex softdep code have been worked out by now. ;-) softdep

Re: What are the disadvantages of soft updates?

On 1/29/2015 12:03 AM, Ted Unangst wrote: error 5 is EIO, input/output error. softdep does not support disks that don't work, to put it bluntly. The original FFS code can cope with disk failure by backing out of the operation, but soft updates reorders things and can't undo what's already been

Re: What are the disadvantages of soft updates?

On Jan 23, 2015, at 6:47 PM, Steve Shockley steve.shock...@shockley.net wrote: On 1/22/2015 9:13 AM, Reyk Floeter wrote: What release and what virtualized SCSI controller where you using? I found my old notes, it turns out it was on 4.6 and the crash message was: softdep_setup_freeblocks:

Re: What are the disadvantages of soft updates?

On Jan 23, 2015, at 12:53 PM, Ingo Schwarze schwa...@usta.de wrote: Hi Predrag, Predrag Punosevac wrote on Fri, Jan 23, 2015 at 03:24:00PM -0500: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD

Re: What are the disadvantages of soft updates?

On Fri, Jan 23, 2015 at 21:47, Steve Shockley wrote: On 1/22/2015 9:13 AM, Reyk Floeter wrote: What release and what virtualized SCSI controller where you using? I found my old notes, it turns out it was on 4.6 and the crash message was: softdep_setup_freeblocks: got error 5 while

Re: What are the disadvantages of soft updates?

On Jan 28, 2015, at 9:03 PM, Ted Unangst t...@tedunangst.com wrote: On Fri, Jan 23, 2015 at 21:47, Steve Shockley wrote: On 1/22/2015 9:13 AM, Reyk Floeter wrote: What release and what virtualized SCSI controller where you using? I found my old notes, it turns out it was on 4.6 and the

Re: What are the disadvantages of soft updates?

Predrag Punosevac punoseva...@gmail.com wrote: Ingo Schwarze schwa...@usta.de wrote: Hi Predrag, Hi Ingo, Predrag Punosevac wrote on Fri, Jan 23, 2015 at 03:24:00PM -0500: I was following this discussion with the great interest but without intend to participate in it until

Re: What are the disadvantages of soft updates?

I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD servers (5.6 sparc64) runs Mollify and last night I received an e-mail from an angry user who could not upload files (the upload will fail or upload the file with

Re: What are the disadvantages of soft updates?

Hi Predrag, Predrag Punosevac wrote on Fri, Jan 23, 2015 at 03:24:00PM -0500: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD servers (5.6 sparc64) runs Mollify and last night I received an e-mail from an

Re: What are the disadvantages of soft updates?

On Fri, Jan 23, 2015 at 2:24 PM, Predrag Punosevac punoseva...@gmail.com wrote: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD servers (5.6 sparc64) runs Mollify and last night I received an e-mail from an

Re: What are the disadvantages of soft updates?

Quoting Predrag Punosevac punoseva...@gmail.com: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD servers (5.6 sparc64) runs Mollify and last night I received an e-mail from an angry user who could not upload

Re: What are the disadvantages of soft updates?

On Fri, Jan 23, 2015 at 2:53 PM, Ingo Schwarze schwa...@usta.de wrote: Hi Predrag, Predrag Punosevac wrote on Fri, Jan 23, 2015 at 03:24:00PM -0500: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD

Re: What are the disadvantages of soft updates?

Ingo Schwarze schwa...@usta.de wrote: Hi Predrag, Hi Ingo, Predrag Punosevac wrote on Fri, Jan 23, 2015 at 03:24:00PM -0500: I was following this discussion with the great interest but without intend to participate in it until today. Namely one of my OpenBSD servers (5.6 sparc64)

Re: What are the disadvantages of soft updates?

Hi, Amit Kulkarni wrote on Fri, Jan 23, 2015 at 03:05:03PM -0600: One more point to add to Ingo's detailed and very helpful reply. Reboot actually clears /tmp. The reason i didn't mention that is that it definitely doesn't have anything to do with Predrag's problem, which was that /tmp was

Re: What are the disadvantages of soft updates?

On 1/22/2015 9:13 AM, Reyk Floeter wrote: What release and what virtualized SCSI controller where you using? I found my old notes, it turns out it was on 4.6 and the crash message was: softdep_setup_freeblocks: got error 5 while accessing filesystem dev = 0x404, block = 1315, fs = /var panic:

Re: What are the disadvantages of soft updates?

On 1/22/2015 9:13 AM, Reyk Floeter wrote: I've personally had problems with OpenBSD panics with softupdates when running under ESXi when the back-end storage becomes high-latency (aggressive SAN backups, not enough spindles). I haven't tried recently (it was difficult to repro on demand) but I

Re: What are the disadvantages of soft updates?

On Thu, Jan 22, 2015 at 09:02:51AM -0500, Steve Shockley wrote: On 1/21/2015 5:50 AM, frantisek holop wrote: but in my experience it is not that hard to get a corrupted filesystem with softupdates and i had to stop using it. but i seem to attract panics and page faults. I've personally

Re: What are the disadvantages of soft updates?

On 1/21/2015 5:50 AM, frantisek holop wrote: but in my experience it is not that hard to get a corrupted filesystem with softupdates and i had to stop using it. but i seem to attract panics and page faults. I've personally had problems with OpenBSD panics with softupdates when running under

Re: What are the disadvantages of soft updates?

Mihai Popescu, 21 Jan 2015 14:34: but in my experience it is not that hard to get a corrupted filesystem with softupdates and i had to stop using it. but i seem to attract panics and page faults. in the recent past i had corrupted filesystems even without softupdates, up to a point

Re: What are the disadvantages of soft updates?

Alexandre Ratchov, 20 Jan 2015 10:17: in *my* practice, yes. I lost no single file last 10 years despite the frequent system crashes during kernel development experimenting. very nice, i dont doubt that. but in my experience it is not that hard to get a corrupted filesystem with softupdates

Re: What are the disadvantages of soft updates?

On 01/21/15 07:34, Mihai Popescu wrote: ... After watching this thread, I enabled softdep on all FFS partitions thinking that Firefox will speed up a bit. I will see the results in time. Keep in mind what softdeps do -- they improve performance of disk writes. They do nothing for disk reads.

Re: What are the disadvantages of soft updates?

2015-01-20 1:46 GMT+01:00 Currell Berry currellbe...@gmail.com: I was mainly curious as to why soft updates were not enabled by default if they have so many good qualities. Your answers explained this well. At least sun4c but also other memory starved machines (mostly those who do not have a

Re: What are the disadvantages of soft updates?

On Mon, Jan 19, 2015 at 07:10:53PM +, Currell Berry wrote: I infer from your response that soft updates possess: 1. increased overhead over default FFS settings. 2. increased implementation complexity over default FFS settings. Also, I infer that journaling and soft updates provide

Re: What are the disadvantages of soft updates?

:25:51 PM Subject: Re: What are the disadvantages of soft updates? On 01/19/15 14:10, Currell Berry wrote: I infer from your response that soft updates possess: 1. increased overhead over default FFS settings. 2. increased implementation complexity over default FFS settings. for a he stated

Re: What are the disadvantages of soft updates?

On Mon, Jan 19, 2015 at 03:59:34AM +, currellbe...@gmail.com wrote: Hello, The FAQ[1] states that soft updates result in a large performance increase in disk writing performance, and links to a resource[2] which claims that soft updates, in addition to being a performance enhancement,

Re: What are the disadvantages of soft updates?

equivalent guarantees in practice? Thank you, Currell -- Original Message -- From: Alexandre Ratchov a...@caoua.org To: currellbe...@gmail.com Cc: misc@openbsd.org Sent: 1/19/2015 4:44:59 AM Subject: Re: What are the disadvantages of soft updates? On Mon, Jan 19, 2015 at 03:59:34AM +

Re: What are the disadvantages of soft updates?

Message -- From: Alexandre Ratchov a...@caoua.org To: currellbe...@gmail.com Cc: misc@openbsd.org Sent: 1/19/2015 4:44:59 AM Subject: Re: What are the disadvantages of soft updates? On Mon, Jan 19, 2015 at 03:59:34AM +, currellbe...@gmail.com wrote: Hello, The FAQ[1] states

What are the disadvantages of soft updates?

Hello, The FAQ[1] states that soft updates result in a large performance increase in disk writing performance, and links to a resource[2] which claims that soft updates, in addition to being a performance enhancement, can also maintain better disk consistency. Resource 2 links to several