Date: Wed, 12 Jan 2005 16:30:42 -0800 (PST) From: Doug Ambrisko <ambrisko@ambrisko.com> To: Tony Byrne <tonyb@byrnehq.com> Cc: freebsd-stable@freebsd.org Subject: Re: MegaRAID 'Bad Slot' Kernel message and crash. Message-ID: <200501130030.j0D0UgxO089500@ambrisko.com> In-Reply-To: <1433078378.20050111134014@byrnehq.com>
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Tony Byrne writes: | Basically, after some amount of uptime the kernel will emit a "amr0: | Bad slot x completed" message and pretty soon after this the box goes into a | partially unresponsive state forcing us to reboot it. So far the only | thing triggering the problem is the nightly jobs, where the amount of | IO is higher than during the day. | | Before deployment, we tested the box with 5.3-STABLE and managed to | trigger the problem twice. This forced us to try 4.10-STABLE which | was fine in testing and for a number of weeks after deployment. | However, just before new year we saw our first Bad Slot and crash under | 4.10. Since then it has happened 3 more times. We have upgraded the firmware to | the latest version available from Intel, and if anything this has made | the problem worse. | | The machine had 3 disks configured as a single RAID5 array. A fourth | disk is configured as a hot-standby. The card is equipped with 128Mb | of battery-backed cache. Write-back caching is enabled on the card. | Read-ahead caching is enabled in non-adaptive mode. | | Is anyone else using a SRCU42X RAID card and seeing similar | problems to ours? What about other cards supported by the amr driver? We run RAID 10 across 4 drives at work on Dell PE2850's which have amr RAID's and no-one has reported this problem to me (which they do). We run FreeBSD 4.10 & 5.3 on them. This is with and without our local mods. We have most experience with 4.10. Dell has their own firmware version (atleast to call it is a PERC controller). For now this is a "works for me". Doug A.
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